fix: fix online manual image and doc links

doc/manual/pdfgui.texinfo

@@ -1446,7 +1446,7 @@ the comments in the script for detailed explanation.
 To learn more about the tui module and about the objects
 and functions that it returns, please see the API
 documentation for diffpy.pdfgui at
-@url{http://docs.danse.us/diffraction/diffpy.pdfgui/}.
+@url{https://diffpy.github.io/diffpy.pdfgui}.
 
 Feel free to ask at the
 @url{https://groups.google.com/d/forum/diffpy-users, diffpy-users}

doc/source/conf.py

@@ -158,7 +158,7 @@
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
 # directly to the root of the documentation.
-# html_extra_path = []
+html_extra_path = ["../manual"]
 
 # If not '', a 'Last updated on:' timestamp is inserted at every page bottom,
 # using the given strftime format.

doc/source/manual.rst

@@ -13,4 +13,4 @@ Resources used
 - :download:`Nanoparticle structure <manual_resources/Nanoparticle structure.zip>`
 
 .. raw:: html
-    :file: ../manual/html/pdfgui.html
+    :file: ../manual/pdfgui.html

news/html.rst

@@ -0,0 +1,23 @@
+**Added:**
+
+* <news item>
+
+**Changed:**
+
+* <news item>
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* <news item>
+
+**Fixed:**
+
+* Fixed online manual not showing images.
+
+**Security:**
+
+* <news item>