Add Angelology to Quick Access links

Add a quick link to the Biblical Angels (Angelology) study
resource, providing direct access to teachings about angels
from Scripture.

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

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

kjvstudy_org/templates/index.html

@@ -308,6 +308,7 @@ section a[href^="/book/"] {
         <a href="/reading-plans" class="quick-link-btn">Reading Plans</a>
         <a href="/topics" class="quick-link-btn">Topical Index</a>
         <a href="/resources" class="quick-link-btn">All Resources</a>
+        <a href="/biblical-angels" class="quick-link-btn">Angelology</a>
         <a href="/family-tree" class="quick-link-btn">Genealogies</a>
         <a href="/biblical-timeline" class="quick-link-btn">Timeline</a>
     </div>