Image upload process + right-click menu UI

client/scss/app.scss

@@ -14,6 +14,7 @@
 @import 'bulma';
 @import './libs/twemoji-awesome';
 @import './libs/animate.min.css';
+@import './libs/jquery-contextmenu';
 
 @import './components/_alerts';
 @import './components/_editor';