Organize all project files into src subdirectory

- Created new src/ directory
- Copied all project files and folders to src/
- Keeps project structure organized and consolidated

src/.vscode/sftp.json

@@ -0,0 +1,12 @@
+{
+    "name": "Mein Webserver",
+    "host": "192.168.178.88",
+    "protocol": "sftp",
+    "port": 22,
+    "username": "root",
+    "password": "934290",
+    "remotePath": "/var/www/html/",
+    "uploadOnSave": true,
+    "useTempFile": false,
+    "openSsh": false
+}