refactor: refactor for modern layout

- split frontend and backend.
- update backend with modern Python dev strategies.

frontend/static/tmpl/sharingItem.tmpl

@@ -0,0 +1,9 @@
+<div id="ccn-sharingItem-{{:uuid}}" class="collection-item card">
+    <div class="collection-item-words">
+        <p>{{>username}}</p>
+    </div>
+
+    <div id="ccn-sharingItem-btnDelete-{{:uuid}}" uuid="{{:uuid}}" class="collection-item-icon control">
+        <a class="button"><span class="icon is-small"><i class="fas fa-trash"></i></span></a>
+    </div>
+</div>