Fixed issues with relative links in footer

man/mkdocs/overrides/partials/footer.html

@@ -87,7 +87,7 @@
   <!-- Further information -->
    <div class="md-footer-meta md-typeset">
       <center>
-        <a href="./index.html">Main index</a> | <a href="./topics.html">Topics index</a> | <a href="./keywords.html">Keywords index</a> | <a href="./tags.html">Tags index</a> | <a href="./graphical_index.html">Graphical index</a> | <a href="./full_index.html">Full index</a><br>
+        <a href="{{ config.site_url }}index.html">Main index</a> | <a href="{{ config.site_url }}topics.html">Topics index</a> | <a href="{{ config.site_url }}keywords.html">Keywords index</a> | <a href="{{ config.site_url }}tags.html">Tags index</a> | <a href="{{ config.site_url }}graphical_index.html">Graphical index</a> | <a href="{{ config.site_url }}full_index.html">Full index</a><br>
       </center>
      <div class="md-footer-meta__inner md-grid">
       {% include "partials/copyright.html" %}