* bring back grammar extensions

* fix hygiene

* Revert "pull themes from the marketplace"

This reverts commit 0738f76d.

it should avoid to have "warning XXX: No license field" during yarn
build
Signed-off-by: NAurélien Pupier <apupier@redhat.com>

[loc][Query] Source text issue for "Provides syntax highlighting, bracket matching and folding Less files." Fixes #55115

Fixes #30094: The less extension should contribute problem matchers for common less and sass compilers

fixes #29054