update left sidebar to persist resources (#636)

# Description

During the past few docs meetings and community meetings, we have been
talking about ways to provide users information about using napari and
engaging them in the napari community. One idea that kept coming up was
how to provide users easy access to troubleshooting information and
release notes.

After a recent docs meeting, @TimMonko came up with the idea to put a
few frequently used links in the left sidebar. He made a PR that would
add the links to the sidebar on the homepage. Someone else commented
that it would be nice to have the links on other pages.

I had played around with the napari sphinx theme and its templates a
couple of months ago. I had the idea to update the left sidebar's jinja
template to include a persistent section of frequently used links.
Here's a before and after view:

![Screenshot 2025-03-20 at 8 37
42 AM](https://github.com/user-attachments/assets/3b2b8568-9298-43af-bbe4-27f4badf0342)

![Screenshot 2025-03-20 at 8 46
27 AM](https://github.com/user-attachments/assets/65ac1e6f-0b17-4184-a862-ef2b8b574259)

Author: willingc

docs/_templates/sidebar-nav-bs.html

@@ -1,5 +1,8 @@
 {# Displays the TOC-subtree for pages nested under the currently active top-level TOCtree element. #}
 <nav class="bd-docs-nav bd-links" aria-label="{{ _('Section Navigation') }}">
+  <p class="caption" role="heading" aria-level="1">
+    <span class="caption-text">Section Navigation</span>
+  </p>
   <div class="bd-toc-item navbar-nav">
     {{- generate_toctree_html(
     "sidebar",
@@ -9,6 +12,31 @@
     includehidden=theme_sidebar_includehidden | tobool,
     titles_only=True
     )
+
     -}}
+    <p class="caption" role="heading" aria-level="2">
+      <span class="caption-text">Resources</span>
+    </p>
+    <ul class="nav bd-sidenav">
+      <li class="toctree-l1">
+          <a class="reference internal" href="community/meeting_schedule.html">Community calendar</a>
+      </li>
+      <li class="toctree-l1">
+          <a class="reference external" href="https://napari.zulipchat.com/">Community chat</a>
+      </li>
+      <li class="toctree-l1">
+          <a class="reference internal" href="troubleshooting.html">Troubleshooting</a>
+      </li>
+      <li class="toctree-l1">
+          {% if version == "dev" %}
+          <a class="reference internal" href="{{ 'release/index.html' }}">Release notes</a>
+          {% else %}
+          <a class="reference internal" href="{{ 'release/release_' + version.replace('.', '_') + '.html' }}">Latest release notes</a>
+          {% endif %}
+      </li>
+      <li class="toctree-l1">
+          <a class="reference external" href="https://napari.org/island-dispatch">Blog</a>
+      </li>
+    </ul>
   </div>
-</nav>
+</nav>