Modrinth modpack export/toggle instance path

[OrbitalExplorer]

Is your feature request related to a problem? Please describe.
No, it's just annoying, I have a modpack and would like it to export in a modrinth format (docs are out) and I have a tool for that called packwiz and i wanted to put the modpack in my documents folder (because its way easier to navigate to that in the command line) but I can't do that.

Describe the solution you'd like
Add the modrinth export format

Describe alternatives you've considered
Add a toggle for a custom path to your mc instance like the toggle for the java path

[Eskaan]

Duplicate of #768