Quick-Search: Added Quick-search in the topbar

Changed how and what we store in elastic to unify it with how we store
things in mongodb so we can have more generic javascript code
to render the data.

Elastic changes:
  Added:
  Node.project.url

  Altered to store id instead of url
  Node.picture

  Made Post searchable

./manage.py elastic reset_index
./manage.py elastic reindex

Thanks to Pablo and Sybren

src/scripts/js/es6/common/templates/nodes/Posts.js

@@ -0,0 +1,21 @@
+import { NodesBase } from "./NodesBase";
+
+export class Posts extends NodesBase {
+    static create$item(post) {
+        let content = [];
+        let $title = $('<div>')
+            .addClass('display-4 text-uppercase font-weight-bold')
+            .text(post.name);
+        content.push($title);
+        let $post = $('<div>')
+                .addClass('expand-image-links imgs-fluid')
+                .append(
+                    content,
+                    $('<div>')
+                        .addClass('node-details-description mx-auto')
+                        .html(post['properties']['pretty_content'])
+                );
+
+        return $post;
+    }
+}