Remove BPD Events and Sponsored Events from header navigation

Consolidates separate "BPD Events" and "Sponsored Events" navigation entries into a single "Events" link pointing to /events/. Updates both the main navigation in app.py and footer links to reflect the combined events page structure.

Fixes #843

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: kjaymiller

_layouts/_includes/footer.html

@@ -11,8 +11,7 @@ <h3>About us</h3>
         <h3>Quick link</h3>
         <ul>
           <li><a href="/about.html">About Us</a></li>
-          <li><a href="/bpd-events/">BPD Events</a></li>
-          <li><a href="/sponsored-events.html">Sponsored Events</a></li>
+          <li><a href="/events/">Events</a></li>
           <li><a href="/partnerships.html">Partnerships</a></li>
           <li><a href="/about.html#join-the-community">Community</a></li>
           <li><a href="/support.html">Support</a></li>

app.py

@@ -8,12 +8,6 @@
 navigation = [
     {"text": "News", "url": "/blog/blog1.html", "fa": "fa fa-newspaper fa-fw"},
     {"text": "About Us", "url": "/about.html", "fa": "fa fa-info-circle fa-fw"},
-    {"text": "BPD Events", "url": "/bpd-events", "fa": "fa fa-calendar fa-fw"},
-    {
-        "text": "Sponsored Events",
-        "url": "/sponsored-events.html",
-        "fa": "fa fa-handshake fa-fw",
-    },
     {"text": "Discounts", "url": "/partnerships.html", "fa": "fa-regular fa-handshake"},
     {"text": "Events", "fa": "fa fa-calendar fa-fw", "url": "/events.html"},
     {