Refactored file system

Changed the file system to a more ordered state and updated links in
files accordingly. Also the reffering to files is now uniform

php/delete_ticket.php

@@ -0,0 +1,32 @@
+<?php
+session_start();
+if(!isset($_SESSION["loggedIn"])){
+    echo json_encode(["success"=>false,"message"=>"Nicht eingeloggt"]);
+    exit;
+}
+
+$input = json_decode(file_get_contents("php://input"), true);
+$index = $input['index'] ?? null;
+
+if($index === null){
+    echo json_encode(["success"=>false,"message"=>"Kein Index angegeben"]);
+    exit;
+}
+
+$ticketsPath = __DIR__ . '../data/tickets.json';
+$tickets = [];
+
+if(file_exists($ticketsPath)){
+    $tickets = json_decode(file_get_contents($ticketsPath), true);
+}
+
+if(!isset($tickets[$index])){
+    echo json_encode(["success"=>false,"message"=>"Ticket existiert nicht"]);
+    exit;
+}
+
+// Ticket löschen
+array_splice($tickets, $index, 1);
+file_put_contents($ticketsPath, json_encode($tickets, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE), LOCK_EX);
+
+echo json_encode(["success"=>true]);