Add padding to "show all rust team members" button

This makes it a little easier to distinguish between it and the above
per-team sections.

Author: senekor

templates/governance/index.html.hbs

@@ -34,7 +34,7 @@
                 {{> governance/index-team team=team baseurl=../baseurl}}
             {{/each~}}
         </div>
-        <div class="flex">
+        <div class="flex h-20">
           <a href="{{baseurl}}/governance/people" class="center w-100 mw6 button button-secondary">
             {{fluent "governance-rust-project-link"}}
           </a>