Simplify flask (#215)

* Simply flask icon

- Also remove data from copywrite. Its not necessary.
- Rename beaker.svg flask.svg

* Make flask.svg background while to show up in dark theme

Author: jonnew

docfx.json

@@ -35,7 +35,7 @@
       "_enableNewTab": true,
       "_enableSearch": true,
       "pdf": false,
-      "_appFooter": "&copy; 2024 Open Ephys and Contributors. Made with <a href=\"https://dotnet.github.io/docfx\">docfx</a>",
+      "_appFooter": "&copy; Open Ephys and Contributors. Made with <a href=\"https://dotnet.github.io/docfx\">docfx</a>",
       "_appFaviconPath": "favicon.png",
       "_appLogoPath": "logo-light-mode.svg"
     },

images/beaker.svg renamed to images/flask.svg

@@ -18,7 +18,7 @@ title: OpenEphys.Onix1
 
 | [User Guide](xref:getting-started) | [Operator Reference](xref:OpenEphys.Onix1) | <xref:tutorials> | [Hardware Guide](https://open-ephys.github.io/onix-docs/) |
 |:----:|:----:|:----:|:----:|
-| [![User Guide](images/running.svg){width=150}](xref:getting-started) | [![Operator Reference](images/books.svg){width=150}](xref:OpenEphys.Onix1) | [![Tutorials](images/beaker.svg){width=150}](xref:tutorials) |[![Tutorials](images/screwdriver.svg){width=150}](https://open-ephys.github.io/onix-docs/)|
+| [![User Guide](images/running.svg){width=150}](xref:getting-started) | [![Operator Reference](images/books.svg){width=150}](xref:OpenEphys.Onix1) | [![Tutorials](images/flask.svg){width=150}](xref:tutorials) |[![Tutorials](images/screwdriver.svg){width=150}](https://open-ephys.github.io/onix-docs/)|
 | Start here for usage instructions. | Detailed information on library components. | How to make the most of ONIX in Bonsai. | Go to the hardware documentation site. |
 
 </div>