Extract component to add/remove admin/mod/manager

We remove some duplication by doing so.

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

@@ -29,7 +29,10 @@
             <%= administrator.description %>
           </td>
           <td>
-            <%= render Admin::TableActionsComponent.new(administrator) %>
+            <%= render Admin::Roles::TableActionsComponent.new(
+              administrator,
+              actions: [:edit, :destroy]
+            ) %>
           </td>
         </tr>
       <% end %>

app/views/admin/administrators/search.html.erb

@@ -18,16 +18,7 @@
             <td><%= user.name %></td>
             <td><%= user.email %></td>
             <td>
-              <% if user.administrator? && user.administrator.persisted? %>
-                <%= render Admin::TableActionsComponent.new(user.administrator, actions: [:destroy]) %>
-              <% else %>
-                <%= link_to t("admin.administrators.administrator.add"),
-                            { controller: "admin/administrators",
-                              action: :create,
-                              user_id: user },
-                            method: :post,
-                            class: "button success expanded" %>
-              <% end %>
+              <%= render Admin::Roles::TableActionsComponent.new(user.administrator || user.build_administrator) %>
             </td>
           </tr>
         <% end %>