docs: fix markdown documentation of GUI tools

gui/wxpython/animation/g.gui.animation.md

@@ -36,8 +36,7 @@ follow these steps:
 - choose parameter (parameter of *[m.nviz.image](m.nviz.image.md)*) to
   animate (e.g. color_map)
 
-<img src="wxGUI_animation_tool.jpg" data-border="1"
-alt="Animation Tool screenshot" />  
+![Animation Tool screenshot](wxGUI_animation_tool.jpg)
 
 ## NOTE
 

gui/wxpython/datacatalog/g.gui.datacatalog.md

@@ -17,9 +17,8 @@ Data Catalog allows you to:
 Note that projects are called *locations* at some places and in old
 documentation.
 
-<img src="datacatalog.png" data-border="0"
-alt="data catalog screenshot" />  
-Figure: Data Catalog integrated in wxGUI.
+![data catalog screenshot](datacatalog.png)  
+*Figure: Data Catalog integrated in wxGUI.*
 
 ## NOTES
 

gui/wxpython/dbmgr/g.gui.dbmgr.md

@@ -17,14 +17,12 @@ stand-alone module *g.gui.dbmgr*.
 - modify vector map DB connection settings - add, remove or modify
   layers.
 
-[<img src="dbmgr_frame.png" width="600" height="401"
-alt="Attribute Table Manager" />](dbmgr_frame.png)  
+![Attribute Table Manager](dbmgr_frame.png)  
 *Figure: Simple attribute filtering using Attribute Table Manager.*
 
 ### SQL Builder
 
-[<img src="dbmgr_sql_builder.png" width="700" height="287"
-alt="Attribute Table Manager and SQL Builder" />](dbmgr_sql_builder.png)  
+![Attribute Table Manager and SQL Builder](dbmgr_sql_builder.png)  
 *Figure: Attribute filtering using Attribute Table Manager and SQL
 Builder.*
 

gui/wxpython/docs/wxGUI.iscatt.md

@@ -26,8 +26,7 @@ interactivity, which allows user to:
 
 ## TOOL CONTROLS LAYOUT
 
-<img src="wxGUI_iscatt.jpg" data-border="1"
-alt="Interactive Scatter Plot Tool" />  
+![Interactive Scatter Plot Tool](wxGUI_iscatt.jpg)  
 
 If editing mode is activated (the green polygon tool in toolbar), the
 areas which were selected in the scatter plots are highlighted. In the

gui/wxpython/docs/wxGUI.modules.md

@@ -16,8 +16,7 @@ to the command representation which is used in the manuals and
 tutorials. The commands can be used to call the module in the command
 line, Shell scripts or, with a slight modification, in a Python script.
 
-<img src="wxGUI_modules_parameters.png" data-border="0"
-alt="r.neighbors dialog" />
+![r.neighbors dialog](wxGUI_modules_parameters.png)
 
 ### Tabs
 
@@ -33,11 +32,9 @@ The style of the tabs can be changed through *GUI settings* -
 depends on the platform and some styles might be more suitable for
 different platforms.
 
-<img src="wxGUI_modules_style_left.png" data-border="0"
-alt="dialog style left" />
-<img src="wxGUI_modules_style_top.png" data-border="0"
-alt="dialog style top" />  
-Figure: Example of style "left" and "top" on Ubuntu.
+![dialog style left](wxGUI_modules_style_left.png)
+![dialog style top](wxGUI_modules_style_top.png)  
+*Figure: Example of style "left" and "top" on Ubuntu.*
 
 ### Flags
 
@@ -46,7 +43,7 @@ three special flags - *overwrite*, *verbose* and *quiet*. Flags
 *verbose* and *quiet* set the level of verbosity of the module (how
 detailed the messages should be).
 
-<img src="wxGUI_modules_flags.png" data-border="0" alt="dialog flags" />  
+![dialog flags](wxGUI_modules_flags.png)
 
 Modules which output a new map or a new file have the flag *overwrite*
 which must be used when the specified output map or file is already
@@ -92,8 +89,7 @@ to the entry field. In case multiple maps can be specified (denoted by
 *\[multiple\]* label), selecting a map from the popup list will append
 the map names with comma in between.
 
-<img src="wxGUI_modules_widget_selection.png" data-border="0"
-alt="widget for selecting maps" />  
+![widget for selecting maps](wxGUI_modules_widget_selection.png)
 
 If the input file is supposed to be a text file (for example color rules
 in r.colors), it is possible to type the text in the provided box
@@ -104,10 +100,8 @@ so that user's workflow can be reproduced later. With *Load* button we
 can display the content of selected file and edit it directly in the
 box.
 
-<img src="wxGUI_modules_widget_file1.png" data-border="0"
-alt="widget for input files" />
-<img src="wxGUI_modules_widget_file2.png" data-border="0"
-alt="widget for input files" />  
+![widget for input files](wxGUI_modules_widget_file1.png)
+![widget for input files](wxGUI_modules_widget_file2.png)
 
 Figure: In the first image, user specified a full path to a file. In the
 second image, user typed color rules conveniently into the box below,

gui/wxpython/docs/wxGUI.nviz.md

@@ -7,9 +7,6 @@
 
 ## DESCRIPTION
 
-Note: **wxNviz is currently under development. Not all planned
-functionality is already implemented.**
-
 **wxNviz** is a *[wxGUI](wxGUI.md)* **3D view mode** which allows users
 to realistically render multiple *surfaces* (2D raster maps) in a 3D
 space, optionally using thematic coloring, draping 2D *vector* data or
@@ -37,16 +34,16 @@ display mode.
 
 ## 3D View Toolbar
 
-<img src="wxGUI_nviz_toolbar.jpg" data-border="1" alt="toolbar" />  
-  
-![icon](icons/script-save.png)  *Generate command for m.nviz.image*  
+![toolbar](wxGUI_nviz_toolbar.jpg)
+
+![icon](icons/script-save.png)  *Generate command for m.nviz.image*:
 Generate command for m.nviz.image based on current state.
 
-![icon](icons/settings.png)  *Show 3D view mode settings*  
+![icon](icons/settings.png)  *Show 3D view mode settings*:
 Show dialog with settings for wxGUI 3D view mode. The user settings can
 be stored in wxGUI settings file.
 
-![icon](icons/help.png)  *Show help*  
+![icon](icons/help.png)  *Show help*:
 Show this help.
 
 ## 3D View Layer Manager Toolbox
@@ -78,8 +75,8 @@ panel (following label *Look:*):
 - *top* moves the current eye position above the map center.
 - *reset* returns all current view settings to their default values.
 
-<img src="wxGUI_nviz_tools_view.jpg" data-border="1" alt="toolbox" />  
-  
+![toolbox](wxGUI_nviz_tools_view.jpg)
+
 You can adjust the viewer's height above the scene, perspective and
 twist value to rotate the scene about the horizontal axis. An angle of 0
 is flat. The scene rotates between -90 and 90 degrees.
@@ -158,8 +155,8 @@ In the very bottom part of the panel position of surface can be set. To
 move the surface right (looking from the south) choose *X* axis and set
 some positive value. To reset the surface position press *Reset* button.
 
-<img src="wxGUI_nviz_tools_surface.jpg" data-border="1" alt="toolbox" />  
-  
+![wxGUI nviz tools surface](wxGUI_nviz_tools_surface.jpg)
+
 #### Constant surface
 
 It is possible to add constant surface and set its properties like fine
@@ -202,8 +199,8 @@ Currently are implemented these markers:
 Thematic mapping can be used to determine marker color and size (and
 line color and width).
 
-<img src="wxGUI_nviz_tools_vector.jpg" data-border="1" alt="toolbox" />  
-  
+![wxGUI nviz tools vector](wxGUI_nviz_tools_vector.jpg)
+
 #### 3D rasters
 
 3D raster maps (volumes, voxel models) can be displayed either as
@@ -245,8 +242,8 @@ attributes.
 
 3D rasters can be moved the same way like surfaces do.
 
-<img src="wxGUI_nviz_tools_volume.jpg" data-border="1" alt="toolbox" />  
-  
+![toolbox](wxGUI_nviz_tools_volume.jpg)
+
 ### Analysis
 
 *Analysis* tab contains *Cutting planes* panel.
@@ -279,8 +276,8 @@ light color, brightness and ambient. Light position is controlled
 similarly to eye position. If option *Show light model* is enabled light
 model is displayed to visualize the light settings.
 
-<img src="wxGUI_nviz_tools_light.jpg" data-border="1" alt="toolbox" />  
-  
+![toolbox](wxGUI_nviz_tools_light.jpg)
+
 The *Fringe* panel allows you to draw fringes in different directions
 (North & East, South & East, South & West, North & West). It is possible
 to set the fringe color and height of the bottom edge.
@@ -316,9 +313,6 @@ parameters, or to set the background color of the Map Display Window
 
 ## NOTE
 
-wxNviz is under active development and distributed as "Experimental
-Prototype".
-
 Please note that with wxGTK port of wxPython (Linux systems), a problem
 might appear during wxNviz initialization (nothing is rendered at all)
 or when rendering vectors (bad order of rendering surfaces and vectors).

gui/wxpython/docs/wxGUI.toolboxes.md

@@ -33,7 +33,7 @@ Following lines can be copied to `.grass8/toolboxes/main_menu.xml` and
 by removing, adding or reordering lines users can change the main menu
 items. See further examples.
 
-```sh
+```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <toolbox name="MyMainMenu">
   <label>Default GRASS GIS main menu bar</label>
@@ -62,7 +62,7 @@ toolboxes are linked through `name` attribute.
 Apart from `subtoolbox` tag, tag `toolbox` can contain individual items
 (modules) and separators (for visual separation in the menu tree).
 
-```sh
+```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <toolboxes>
   <toolbox name="Raster">
@@ -104,7 +104,7 @@ If we are for example working only with raster data, we can hide menu
 items *Vector* and *Database*. The file `main_menu.xml` then contains
 the following lines where we omitted the two toolboxes:
 
-```sh
+```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <toolbox name="CustomizedMainMenu">
   <label>Default GRASS GIS main menu bar</label>
@@ -126,7 +126,7 @@ In this example we create a new toolbox *Favorites* containing existing
 GRASS module and toolbox, custom module created by the user and addon
 module. The `toolboxes.xml` file contains following lines:
 
-```sh
+```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <toolboxes>
   <toolbox name="MyFavorites">
@@ -154,7 +154,7 @@ module. The `toolboxes.xml` file contains following lines:
 Optionally, we can add this toolbox to the main menu items. The
 `main_menu.xml` file contains following lines:
 
-```sh
+```xml
 <?xml version="1.0" encoding="UTF-8"?>
 <toolbox name="CustomizedMainMenu">
   <label>Default GRASS GIS main menu bar</label>
@@ -177,9 +177,8 @@ If we have `user-toolboxes-list` tag in the `main_menu.xml` file, our
 custom toolbox will be listed in the automatically added *Toolboxes*
 main menu item. The screenshot shows the resulting menu:
 
-<img src="wxGUI_toolboxes.jpg" data-border="0"
-alt="Toolboxes - menu customization" />  
-
+![Toolboxes - menu customization](wxGUI_toolboxes.jpg)
+
 ## NOTES
 
 After the first start of wxGUI with custom toolboxes, `.grass/toolboxes`

gui/wxpython/docs/wxGUI.vnet.md

@@ -12,11 +12,10 @@ launched from Layer Manager menu *Vector → Network analysis → Vector
 network analysis tool* or from Map Display toolbar *Analyse map → Vector
 network analysis tool* ![icon](icons/vector-tools.png).
 
-<img src="wxGUI_vnet.jpg" data-border="1"
-alt="Vector Network Analysis Tool" />  
-Subsets for nearest centers (*[v.net.alloc](v.net.alloc.md)*)
+![Vector Network Analysis Tool](wxGUI_vnet.jpg)  
+*Subsets for nearest centers ([v.net.alloc](v.net.alloc.md))*
 
-*Vector Network Analysis Tool* currently allows you to:
+Vector Network Analysis Tool currently allows you to:
 
 - perform these network analyses:
   - Shortest path (*[v.net.path](v.net.path.md)*)