Add Nerd-Font Symbols to VSCode Editor Config

[mheuvel-dev]

Currently, the VS Code user template doesn't specify any nerd font symbols, see

https://github.com/ublue-os/bluefin/blob/main/system_files/dx/etc/skel/.config/Code/User/settings.json

I stumbled on this discussion:
https://universal-blue.discourse.group/t/how-does-one-enable-nerd-fonts-display-in-vs-code-integrated-terminal/4274

@castrojo asked whether or not to add a nerd font by default, but I didn't see follow up.

Looking at the current image, we have 3 options:

1. no default nerd font support (as it is now);
2. use the MesloLGL Nerd Font (or its mono variant);
3. use the nerd-font fallback 'Symbols Nerd Font Mono'.

I also see a new request to clean up some of the currently installed fonts, #2190.
For this reason, I would opt for Option 3 (use the 'Symbols Nerd Font Mono'). Users can always add a font specific to their taste.

By adding this option to the list of editor fonts in the settings.json skeleton, the VS Code terminal will automatically render nerd symbols out of the box.

Thanks for considering and the great work!

P.S. if no objections, I wouldn't mind making a PR for this as a first-time contribution.

[castrojo]

Looks like we're good, thanks!