Added backend and refactored frond-end to support it.

* Removed unecesery home page
* Added PHP Api that provides auth and replaces the json-server for data storage
* Added support for alternate geocode-api
* Added registration  page

api/auth/logout.php

@@ -0,0 +1,7 @@
+<?php
+session_start();
+session_unset();
+session_destroy();
+
+echo json_encode(['success' => true]);
+?>