Frontend fixes (#267)

* Fix mermaid display

* Move Login/Register buttons on mobile

* Min width on avatar

templates/partials/_gist_preview.html

@@ -5,7 +5,7 @@
         <div class="flex ">
             <div class="div">
                 <a href="{{ .c.ExternalUrl }}/{{ .gist.User.Username }}">
-                    <img class="h-10 w-10 rounded-md mr-2 border border-gray-200 dark:border-gray-700 my-1" src="{{ avatarUrl .gist.User .DisableGravatar }}" alt="{{ .gist.User.Username }}'s Avatar">
+                    <img class="h-10 min-w-10 w-10 rounded-md mr-2 border border-gray-200 dark:border-gray-700 my-1" src="{{ avatarUrl .gist.User .DisableGravatar }}" alt="{{ .gist.User.Username }}'s Avatar">
                 </a>
             </div>
             <div class="flex-auto">