Use a button to destroy officials

As mentioned in commits 5311daadf and bb958daf0, using links combined
with JavaScript to generate POST (or, in this case, DELETE) requests to
the server has a few issues.

app/assets/stylesheets/admin/action.scss

@@ -3,4 +3,8 @@
   &[disabled] {
     @include button-disabled;
   }
+
+  &.delete {
+    cursor: pointer;
+  }
 }

app/views/admin/officials/edit.html.erb

@@ -14,9 +14,17 @@
     <%= f.text_field :official_position %>
     <%= f.select :official_level, official_level_options %>
     <%= f.submit class: "button" %>
+  <% end %>
+
   <% if @user.official? %>
     <br>
-      <%= link_to t("admin.officials.edit.destroy"), admin_official_path(@user), method: :delete, class: "delete" %>
-    <% end %>
+    <%= render Admin::ActionComponent.new(
+      :destroy,
+      @user,
+      text: t("admin.officials.edit.destroy"),
+      path: admin_official_path(@user),
+      method: :delete,
+      class: "delete"
+    ) %>
   <% end %>
 </div>

spec/system/admin/officials_spec.rb

@@ -63,7 +63,7 @@ describe "Admin officials", :admin do
   scenario "Destroy" do
     visit edit_admin_official_path(official)
 
-    click_link 'Remove "Official" status'
+    click_button 'Remove "Official" status'
 
     expect(page).to have_content "Details saved: the user is no longer an official"
     expect(page).to have_current_path(admin_officials_path, ignore_query: true)