Allow admins to add and remove invitations per account

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

@@ -0,0 +1,21 @@
+<h3>Add new invitations to <%= @user.cn %>'s account</h3>
+<%= form_with(url: invitations_admin_user_path, method: :post) do |form| %>
+  <ul role="list">
+    <%= render FormElements::FieldsetComponent.new(
+      positioning: :horizontal,
+      title: "Amount"
+    ) do %>
+      <%= form.select :amount, options_for_select([
+        ["3", "3"], ["5", "5"], ["10", "10"], ["20", "20"]
+      ]) %>
+    <% end %>
+    <%= render FormElements::FieldsetToggleComponent.new(
+      field_name: "notify_user",
+      enabled: true,
+      title: "Notify user via email"
+    ) %>
+  </ul>
+  <p class="pt-6 border-t border-gray-200 text-right">
+    <%= form.submit 'Add', class: "btn-md btn-blue w-full" %>
+  </p>
+<% end %>