Customize navigation panel footer

1. Check that _includes/nav_footer_custom.html does not exist.

2. Check that the navigation panel footer on the home page is “This site uses Just the Docs, a documentation theme for Jekyll.”.

3. Customize the nav footer by creating _includes/nav_footer_custom.html and adding:

   <footer class="site-footer">
     This site uses 
     <a href="https://github.com/just-the-docs/just-the-docs">Just the Docs</a>,
     a documentation theme for Jekyll.
     <br> {{ site.remote_theme | replace: "@", " @" }}
   </footer>
   

4. Refresh the page.

5. Check that the nav footer is now:

   This site uses Just the Docs, a
   documentation theme for Jekyll.\

6. Remove _includes/nav_footer_custom.html.