Client: semantic ui -> bootstrap 4 and less -> scss (#8535)

* client: semantic ui -> bootstrap 4 and less -> scss

* start porting components to boostrap

* port header, start porting menu

* port loading screen

* port most of the menu

* port secondary menus

* port guilds and stable

* disable tavern for now, port inbox

* typo

* put back old tavern code

website/client/components/parentPage.vue

@@ -1,10 +1,9 @@
 <template lang="pug">
 .row
-  .sixteen.wide.column
-    router-view.row
+  .col
+    router-view
 </template>
 
 <script>
-export default {
-};
+export default { };
 </script>