Remove docs footer bar and nav sync button

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

docs/custom.css

@@ -8,6 +8,11 @@ html {
     --side-nav-fixed-width: 210px;
 }
 
+/* Hide tree sync button */
+#nav-sync {
+    display: none;
+}
+
 /* Seamless split <code> tags for Fortran % struct accessors.
  * Doxygen consumes %<word> even inside code spans, so we split around %
  * into adjacent <code> elements and remove internal borders/padding. */

docs/footer.html

@@ -1,17 +1,8 @@
 <!-- HTML footer for doxygen 1.9.1-->
 <!-- start footer part -->
 <!--BEGIN GENERATE_TREEVIEW-->
-<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
-  <ul>
-    $navpath
-    <li class="footer">$generatedby <a href="https://www.doxygen.org/index.html"><img class="footer" src="$relpath^doxygen.svg" width="104" height="31" alt="doxygen"/></a> $doxygenversion </li>
-  </ul>
-</div>
 <!--END GENERATE_TREEVIEW-->
 <!--BEGIN !GENERATE_TREEVIEW-->
-<hr class="footer"/><address class="footer"><small>
-$generatedby&#160;<a href="https://www.doxygen.org/index.html"><img class="footer" src="$relpath^doxygen.svg" width="104" height="31" alt="doxygen"/></a> $doxygenversion
-</small></address>
 <!--END !GENERATE_TREEVIEW-->
 </body>
 </html>