migrate from pkg to "Single executable applications"

[ildar]

https://github.com/vercel/pkg/blob/main/README.md :

Important

pkg has been deprecated with 5.8.1 as the last release. There are a number of successful forked versions of pkg already with various feature additions. Further, we’re excited about Node.js 21’s support for single executable applications. Thank you for the support and contributions over the years. The repository will remain open and archived.

[milahu]

ideally remove the complex build process
and make it work with npm install -g vdhcoapp
using ffmpeg from $PATH or ~/.config/vdhcoapp/config.json
ffmpeg should be installed system-wide like sudo apt install ffmpeg
at least thats what im doing in vdhcoapp.nix