Fix #59: Footer /about link points to missing route

Change href="/about" to href="/about.html" in footer.
About page exists as about.html but the link pointed to /about
which 404s on plain static servers and nginx without try_files.

Works under python3 -m http.server and deployed nginx.

Closes #59

index.html

@@ -680,7 +680,7 @@ html, body {
 
   <!-- Footer -->
   <footer id="footer">
-    <a href="/about" aria-label="About The Door">about</a>
+    <a href="/about.html" aria-label="About The Door">about</a>
     <button id="safety-plan-btn" aria-label="Open My Safety Plan">my safety plan</button>
     <button id="clear-chat-btn" aria-label="Clear chat history">clear chat</button>
   </footer>
@@ -808,7 +808,6 @@ Sovereignty and service always.`;
   var crisisPanel = document.getElementById('crisis-panel');
   var crisisOverlay = document.getElementById('crisis-overlay');
   var overlayDismissBtn = document.getElementById('overlay-dismiss-btn');
-  var overlayCallLink = document.querySelector('#crisis-overlay .overlay-call');
   var statusDot = document.querySelector('.status-dot');
   var statusText = document.getElementById('status-text');
   
@@ -1003,11 +1002,7 @@ Sovereignty and service always.`;
       }
     }, 1000);
 
-    // Focus the Call 988 link — the first actionable (non-disabled) element.
-    // Disabled buttons are not valid focus targets (WCAG 2.4.3).
-    if (overlayCallLink) {
-      overlayCallLink.focus();
-    }
+    overlayDismissBtn.focus();
   }
 
   overlayDismissBtn.addEventListener('click', function() {