[RFC] Switch flake repos to git-submodules

[Mephistophiles]

I saw you moved tree-sitter modules from git-submodules to flakes. But this a little limits the appearance to build from a non-nix build system. Why did you drop support for git-submodules?

[BrianHicks]

A couple reasons:

• submodules have pretty terrible UX in the git command line. Maybe they're better in some client, but we can't rely on that.
• some Nix things don't support submodules. I don't remember which right now but it was a real pain.

Making symlinks or subtrees would solve this. I chose symlinks because subtrees add a lot of unrelated commits to the repo.

If this changes, I don't think we should go back to submodules, but get rid of embedded grammars altogether as in #88.

[Mephistophiles]

Thanks for the clarification!:)