Add repo link, remove prev and next buttons

theme_customization/versions.html

+<div class="rst-versions" role="note" aria-label="{% trans %}Versions{% endtrans %}">
+  <span class="rst-current-version" data-toggle="rst-current-version">
+    <span>
+      <a href="{{ config.repo_url }}" class="icon icon-gitlab" style="color: #fcfcfc"> Source</a>
+    </span>
+  </span>
+</div>
\ No newline at end of file