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/views/verification/verified_user/show.html.erb

@@ -13,8 +13,8 @@
         <% @verified_users.each do |verified_user| %>
           <% if verified_user.email.present? %>
             <li id="<%= dom_id(verified_user) %>_email">
-                <span><%= mask_email(verified_user.email) %></span>
-                <span><%= render "form", url: email_path, verified_user: verified_user %></span>
+              <span><%= mask_email(verified_user.email) %></span>
+              <span><%= render "form", url: email_path, verified_user: verified_user %></span>
             </li>
           <% end %>
         <% end %>