JS frontend stuff

Move old ember frontend to properly named folder
Add vue based new frontend

frontend-reactive/app/components/note/content.hbs

@@ -1,19 +0,0 @@
-<div class="note-content">
-  <p class="note-content-text">{{this.visibleContent}}</p>
-  {{#if this.canExpand}}
-  {{#if this.collapsed}}
-    <div
-      type="button"
-      class="note-content-toggle"
-      {{on "click" this.expand}}
-    >{{t "note.expand"}}</div>
-  {{else}}
-    <div
-      type="button"
-      class="note-content-toggle"
-      {{on "click" this.collapse}}
-      >{{t "note.collapse"}}</div>
-  {{/if}}
-
-  {{/if}}
-  </div>