Improve clarity and formatting of How to Contribute page

DISCOVER/14_how_to_contribute.md

@@ -1,10 +1,16 @@
-(how_to_contribute)=
-# Contributing
+#Contributing
 
-NumFOCUS invites the community to make suggestions for improvements to the DISCOVER Cookbook via [pull request (PR)](https://github.com/numfocus/DISCOVER-Cookbook/pulls). PRs will be evaluated by the NumFOCUS DISC Committee and/or its volunteers. PRs should be written so as to conform to the [NumFOCUS Contributor Code of Conduct](https://www.numfocus.org/about/code-of-conduct/). You can also [open an issue](https://github.com/numfocus/DISCOVER-Cookbook/issues) to suggest an update.
+NumFOCUS invites the community to suggest improvements to the DISCOVER Cookbook through pull requests (PRs).
+All PRs are reviewed by the NumFOCUS DISC Committee and/or its volunteers.
+Contributions must follow the [NumFOCUS Contributor Code of Conduct](https://www.numfocus.org/about/code-of-conduct/).
+
+You can also [open an issue](https://github.com/numfocus/DISCOVER-Cookbook/issues) to suggest updates or improvements.
+
+If you find this cookbook useful, you can support NumFOCUS in the following ways:
+
+- If you have a GitHub account, star the [repository](https://github.com/numfocus/DISCOVER-Cookbook) to increase its visibility.
+- Include a link on your event website to credit NumFOCUS:  
+  **Reference:** [NumFOCUS DISCOVER Diversity and Inclusion Cookbook](https://discover-cookbook.numfocus.org)
+- Share feedback, whether positive or suggestions for improvement, by opening an issue under [Issues](https://github.com/numfocus/DISCOVER-Cookbook/issues).
 
-If you find this Cookbook useful please support NumFOCUS and our work in these ways:  
-* If you have a GitHub account, "star" the [repository](https://github.com/numfocus/DISCOVER-Cookbook) to elevate its visibility
-* Include a link on your events website to credit NumFOCUS:  **Reference:**  [NumFOCUS DISCOVER Diversity and Inclusion Cookbook](https://discover-cookbook.numfocus.org)
-* Any feedback, positive or suggestions, is welcome and can be placed under [Issues](https://github.com/numfocus/DISCOVER-Cookbook/issues)
 

DISCOVER/_templates/footer.html

@@ -0,0 +1,9 @@
+<div class="numfocus-footer" style="text-align:center; margin-top:2rem;">
+  <a href="https://numfocus.org" target="_blank" rel="noopener">
+    <img
+      src="{{ pathto('_static/images/numfocus-logo.png', 1) }}"
+      alt="NumFOCUS"
+      style="height:40px;"
+    >
+  </a>
+</div>

DISCOVER/conf.py

@@ -72,6 +72,16 @@
     'path_to_docs': 'DISCOVER', 
     'repository_url': 'https://github.com/numfocus/DISCOVER-Cookbook/', 
     'repository_branch': 'main', 
+    'extra_footer': """
+<div class="numfocus-footer">
+  <a href="https://numfocus.org" target="_blank" rel="noopener">
+    <img src="_static/images/numfocus-logo.png"
+         alt="NumFOCUS"
+         style="height:40px; margin-top:10px;">
+  </a>
+</div>
+""",
+
     'extra_footer': '', 
     'home_page_in_toc': True, 
     'announcement': '', 

requirements.txt

@@ -1,2 +1,3 @@
 jupyter-book
-sphinx-tags
+sphinx-tags
+sphinx-togglebutton