Add invite button and routes for resending invitations

app/views/admin/users/index.html.erb

@@ -66,6 +66,9 @@
                 <%= user.groups.count %>
               </td>
               <td class="relative whitespace-nowrap py-4 pl-3 pr-4 text-right text-sm font-medium sm:pr-0">
+                <% if user.pending_invitation? %>
+                  <%= button_to "Resend", resend_invitation_admin_user_path(user), method: :post, class: "text-yellow-600 hover:text-yellow-900 mr-4" %>
+                <% end %>
                 <%= link_to "Edit", edit_admin_user_path(user), class: "text-blue-600 hover:text-blue-900 mr-4" %>
                 <%= button_to "Delete", admin_user_path(user), method: :delete, data: { turbo_confirm: "Are you sure you want to delete this user?" }, class: "text-red-600 hover:text-red-900" %>
               </td>

app/views/layouts/application.html.erb

@@ -46,7 +46,7 @@
       </div>
     <% else %>
       <!-- Public layout (signup/signin) -->
-      <main class="container mx-auto mt-28 px-5 flex">
+      <main class="container mx-auto mt-28 px-5">
         <%= render "shared/flash" %>
         <%= yield %>
       </main>