Problem: Using `url` for both remote repo and local path complicates the
code.
Solution: Add `path` field that overrides `url` and bypasses
git-specific manipulations, i.e., the contents of the `path` are used
as-is (no git repo needed).
This means `:TSUpdate` will skip such parsers; use `:TSInstall!` instead
after making local changes.
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Co-authored-by: Lewis Russell <lewis6991@gmail.com>
