Fix documentation

This commit fixes multiple issues with documentation.

1. Duplicated requirejs

The nbsphinx extension introduced in #2393 pulled a requirejs
which caused the initialization script to halt.

As a result, the right side bar was left uninitialized.

2. Undefined variable error

It turned out that PyTorch's theme expected the downstream projects
to define `collapsedSections` variable.

Currently console log shows `collapsedSections is not defined`.
As a result of this fix, we start to see the + symbol on left side.

3. Fix the behavior of default expand

Tweaks the right-side bar initialization behavior
so that expand-all only happens once, not at every resize.

4. Overwrite the link to GitHub

The `GitHub` tab in main-menu always linked PyTorch core.
This commit adds overwrite to torchaudio page

docs/source/_templates/layout.html

@@ -54,7 +54,9 @@
 #}
 
 {%- block footer %}
-
+    <script type="text/javascript">
+    var collapsedSections = []
+    </script>
     {{ super() }}
     <script type="text/javascript">
       $(document).ready(function() {
@@ -69,30 +71,42 @@
 	      $(".pytorch-call-to-action-links a[data-response='Run in Google Colab']").attr("href", colabLink);
 	      $(".pytorch-call-to-action-links a[data-response='View on Github']").attr("href", githubLink);
 	  }
-      });
-    </script>
 
-    {% if 'tutorial' in pagename %}
-    {#
-     # Override the right side menu bar behavior so that subsections
-     # are shown by default in tutorial page.
-     # Based off of
-     # https://github.com/pytorch/pytorch_sphinx_theme/blob/b4d00058a48604d8fb63771b513a50450f0ee188/pytorch_sphinx_theme/static/js/theme.js#L568-L579
-     #}
-    <script type="text/javascript">
-      $(window).ready(function() {
-          var original = window.sideMenus.bind;
-          window.sideMenus.bind = function() {
-              original();
-              $("#pytorch-right-menu a.reference.internal").each(function(i) {
-                  if (this.classList.contains("not-expanded")) {
-                      this.nextElementSibling.style.display = "block";
-                      this.classList.remove("not-expanded");
-                      this.classList.add("expanded");
-                  }
-              });
-          };
+          var overwrite = function(_) {
+              if ($(this).length > 0) {
+                  $(this)[0].href = "https://github.com/pytorch/audio"
+              }
+          }
+          // PC
+          $(".main-menu a:contains('GitHub')").each(overwrite);
+          // Mobile
+          $(".main-menu a:contains('Github')").each(overwrite);
       });
+
+      {% if 'tutorial' in pagename %}
+      {#
+       # Override the right side menu bar behavior so that subsections
+       # are shown by default in tutorial page.
+       # Based off of
+       # https://github.com/pytorch/pytorch_sphinx_theme/blob/b4d00058a48604d8fb63771b513a50450f0ee188/pytorch_sphinx_theme/static/js/theme.js#L568-L579
+       #}
+       $(window).ready(function() {
+           var original = window.sideMenus.bind;
+           var startup = true;
+           window.sideMenus.bind = function() {
+               original();
+               if (startup) {
+                   $("#pytorch-right-menu a.reference.internal").each(function(i) {
+                       if (this.classList.contains("not-expanded")) {
+                           this.nextElementSibling.style.display = "block";
+                           this.classList.remove("not-expanded");
+                           this.classList.add("expanded");
+                       }
+                   });
+                   startup = false;
+               }
+           };
+       });
     </script>
     {% endif %}
 {% endblock %}

docs/source/conf.py

@@ -54,6 +54,8 @@
     "nbsphinx",
 ]
 
+nbsphinx_requirejs_path = ""
+
 autodoc_member_order = "bysource"
 
 # katex options