Add systemd service configurations for x11vnc and noVNC

Update README.md with detailed systemd service files for:
- x11vnc service to enable VNC server on display :0
- noVNC service to provide web-based VNC access
- Include proper service dependencies and environment settings

desktop_env/server/README.md

@@ -112,6 +112,7 @@ sudo snap install novnc
 Description=noVNC Service
 After=x11vnc.service network.target snap.novnc.daemon.service
 Wants=x11vnc.service
+
 [Service]
 Type=simple
 ExecStart=/snap/bin/novnc --vnc localhost:5900 --listen 5910
@@ -122,6 +123,7 @@ Environment=XAUTHORITY=/home/user/.Xauthority
 Environment=SNAP_COOKIE=/run/snap.cookie
 Environment=SNAP_NAME=novnc
 Environment=SNAP_REVISION=current
+
 [Install]
 WantedBy=default.target
 ```
@@ -131,6 +133,7 @@ Write a file `x11vnc.service` with the following content:
 Description=X11 VNC Server
 After=display-manager.service network.target
 Wants=display-manager.service
+
 [Service]
 Type=simple
 ExecStart=x11vnc -display :0 -rfbport 5900 -forever
@@ -139,6 +142,7 @@ Restart=on-failure
 RestartSec=3
 Environment=DISPLAY=:0
 Environment=XAUTHORITY=/home/user/.Xauthority
+
 [Install]
 WantedBy=default.target
 ```