Update foundational supporters display with collapsible sections

- Replace article elements with details/summary for better UX
- Add sorting to supporter lists for consistent ordering
- Set current year as default open section
- Improve navigation between different years

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: kjaymiller

_layouts/_includes/foundational_supporters.html

@@ -2,11 +2,12 @@
   <h2>Foundational Supporters</h2>
   <p>Black Python Devs operates primarily on support from individuals. It is those supporters that serve as the foundation for what we do.</p>
   <p>We would like to recognize our supporters who donate at least $200 each year.</p>
-  {% for year in data %}
-  <article>
-    <h3>{{year}} Supporters</h3>
+
+  {% for data_year in data %}
+  <details name="{{data_year}}" {% if data_year="" ="year" %}open{% endif %}>
+    <summary>{{data_year}}</summary>
     <div class="grid">
-      {% for data_lists in data[year] | slice(3) %}
+      {% for data_lists in data[data_year] | sort | slice(3) %}
       <section class="">
         <div>
           <ul>
@@ -18,7 +19,7 @@ <h3>{{year}} Supporters</h3>
       </section>
       {% endfor %}
     </div>
-  </article>
+  </details>
   {% endfor %}
   <p>You can view the archive of supporters<sup>*</sup> by year at https://github.com/blackpythondevs/blackpythondevs.</p>
   <p>* <sub>Those who marked their desire to remain anonymous have not been included</sub></p>