I removed the grammar recipes in 3b58741 to avoid redundancy with the
upstream recipes, but didn't realize that those upstream recipes weren't
added until Emacs 31, so users on 30 and older would get errors when
trying to install any missing grammars.
This also establishes a hard dependency between :lang (php +tree-sitter)
and :lang ({javascript,web} +tree-sitter).
Amend: 3b58741522
These optional dotfiles indicate the root of a module or module
group (:lang), and will later contain module metadata. They will also
serve as an alternative to packages.el and doctor.el, and will aide the
parts of the v3.0 module API concerned with resolving the current module
from a path (`doom-module-from-path`), which currently rely too heavily
on parsing path strings.
For now, however, they're simply placeholders.
