docs: add eslint (#4805)

* docs: add eslint

* chore: remove @eslint/css

* feat(docs): add custom eslint rule for css variables

* ci: check lint on css changes in docs

* ci: update lefthook configuration

lefthook.yml

@@ -3,9 +3,15 @@ pre-commit:
   commands:
     lint:
       glob: "*.{js,ts,jsx,tsx}"
+      exclude: "docs/**/*"
       run: bun lint
+    lint-docs:
+      # using @widlarzgroup/eslint-plugin-docusaurus for CSS variable validation
+      root: "docs/"
+      glob: "**/*.{js,ts,jsx,tsx,css}"
+      run: bun run lint
     types:
-      glob: "*.{js,ts, jsx, tsx}"
+      glob: "*.{js,ts,jsx,tsx}"
       run: bun typecheck
 commit-msg:
   parallel: true