Support for YT music links in youtube.lua

Not sure if/how it's feasible, but for now, YT music links are not supported. For example: https://music.youtube.com/watch?v=z0dxfnr-HjY

It seems that getting rid of the music subdomain returns a valid URL but some restrictions may then apply (geo restriction, 4.3 errors, ...).

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information