Use HTML beautifier to indent ERB files

We had inconsistent indentation in many places. Now we're fixing them
and adding a linter to our CI so we don't accidentally introduce
inconsistent indentations again.

app/components/layout/admin_header_component.html.erb

@@ -13,7 +13,8 @@
     <h1>
       <%= link_to namespace_path do %>
         <%= setting["org_name"] %>
-        <br><small><%= namespaced_header_title %></small>
+        <br>
+        <small><%= namespaced_header_title %></small>
       <% end %>
     </h1>