Fix web VNC app

[Tuxliri]

Improve static file serving, update the noVNC launch process, and clean up legacy or problematic code.

Frontend and Static File Serving Improvements:

• Updated Nginx routing.
• Changed the VNC frontend to load static/novnc/vnc.html instead of static/vnc.html, aligning with the new static file structure.

noVNC Launch and Supervisor Configuration:

• Changed supervisor configuration to launch novnc_proxy directly instead of using the older launch.sh script

Codebase Cleanup and Dependency Updates:

• Cleaned up Dockerfile and dependencies by removing unused build steps and legacy camera calibration.

Testing

1. Clone my fork of the duckietown-shell-commands repo and checkout the use-parsed-distro-in-dts-code-vnc-command-DTSW-7385 branch (here).
2. Clone this branch of the dt-gui-tools and build it using dts devel build
3. Run dts code vnc in any ente lx (for example the control lx available here)
4. Follow the onscreen instructions to open the VNC viewer (if the page does not load correctly you might need to reload the page with SHIFT+CMD+R for it to load).

[Tuxliri]

This has been tested and confirmed working on Ubuntu 24.04 (amd64) and macOS (devcontainer).

[tanij]

Tested, works