I want to publish a new version of the Zed plugin, and it points to the
Tree-sitter grammar by commit. This is what got the whole "rcl patch"
thing started!
So now, upon export of the Zed extension, we'll pin it to the HEAD of
the adjacent tree-sitter-rcl repository.
I want to make a Zed extension, and it looks like Zed does not support
Tree-sitter grammars that do not live at the repository root, so let's
just make a separate repository to dump a generated copy of the grammar
in. It will also make integration with other Tree-sitter consumers
easier.