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/check_session.php

@@ -0,0 +1,10 @@
+<?php
+require_once 'config/auth.php';
+
+session_start();
+if (isset($_SESSION['name'])) {
+    echo json_encode(['message' => 'Authorized', 'user' =>   $_SESSION['name'] , 'allowRegistration' => $AllowUserRegistration]);
+} else {
+    http_response_code(401);
+    echo json_encode(['message' => 'Unauthorized', 'allowRegistration' => $AllowUserRegistration]);
+}