Use yt-dlp templates

[stefnotch]

https://github.com/yt-dlp/yt-dlp#output-template seem to be documented and have a sensible format and can be printed with the --print flag https://github.com/yt-dlp/yt-dlp#verbosity-and-simulation-options

[stefnotch]

(And if anyone wants a sensible input format, here is where yt-dlp sets up its options code https://github.com/yt-dlp/yt-dlp/blob/master/yt_dlp/options.py )

[stefnotch]

https://github.com/colinhacks/zod