Move to more long-term solution for mirroring Windows Terminal APIs

[tieneupin]

Currently, we are parsing the Releases page for links to the Windows Terminal releases. It works, but is heavily dependent on regex matching.

We want to move to parsing the GitHub Releases API instead, and will need to incorporate GitHub authentication into Murfey to do so.

[tieneupin]

MSYS2 environments can be run via either CMD or PowerShell (albeit a bit janky), so Windows Terminal is no longer needed for now.