Factor out popup menu component.

Factor out the popup menu inside user tooltips into a reusable
component.

app/components/popup_menu_component/popup_menu_component.html.erb

@@ -0,0 +1,11 @@
+<div class="popup-menu">
+  <a class="popup-menu-button" href="javascript:void(0)">
+    <i class="fas fa-ellipsis-h"></i>
+  </a>
+
+  <ul class="popup-menu-content">
+    <% items.each do |item| %>
+      <li><%= item %></li>
+    <% end %>
+  </ul>
+</div>