[gtk/docs-gtk-org] static: Add GTK3 references to the landing page

[Emmanuele Bassi <ebassi src gnome org>]

commit d4e1a68071da96b438bcfd7e5de040375816d33d
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sat Jul 31 17:50:38 2021 +0100

    static: Add GTK3 references to the landing page

 static/index.html | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
---
diff --git a/static/index.html b/static/index.html
index 3df5db400e..5b2736c7f8 100644
--- a/static/index.html
+++ b/static/index.html
@@ -45,6 +45,7 @@ SPDX-License-Identifier: LGPL-2.1-or-later
         <div class="links">
           <a href="#user-interface">User interface</a>
           <a href="#core-libraries">Core libraries</a>
+          <a href="#older-versions">Older versions</a>
         </div>
       </div>
 
@@ -140,6 +141,23 @@ SPDX-License-Identifier: LGPL-2.1-or-later
         </div>
       </div>
 
+      <div class="toggle-wrapper">
+        <h4 id="older-versions" style="display:flex;">
+          Older versions
+          <a href="#older-versions" class="anchor"></a>
+        </h4>
+
+        <div class="docblock">
+          <h5 id="glib">GTK 3</h5>
+          <p><a href="https://docs.gtk.org/gtk3/"; class="external">GTK 3 API reference</a></p>
+        </div>
+
+        <div class="docblock">
+          <h5 id="gobject">GDK 3</h5>
+          <p><a href="https://docs.gtk.org/gdk3/"; class="external">GDK 3 API reference</a></p>
+        </div>
+      </div>
+
     </section>
 
     <footer>