Revert "Add glossary section and link in top navigation (devcontainers#649)" (devcontainers#650)

This reverts commit ff23006.

Author: abdurriq

_includes/topnav.html

@@ -38,9 +38,6 @@ <h1>Development Containers</h1>
                 <li {% if page.sectionid=='collections' %} class="nav-item active" {% else %} class="nav-item" {% endif %}>
                     <a class="nav-link" href='{{ "/collections" | prepend: site.baseurl }}'>Collections</a>
                 </li>
-                <li {% if page.sectionid=='glossary' %} class="nav-item active" {% else %} class="nav-item" {% endif %}>
-                    <a class="nav-link" href='{{ "/glossary" | prepend: site.baseurl }}'>Glossary</a>
-                </li>
             </ul>
         </div>