Use npm script for linters

lint-action doesn't work for forks

.github/workflows/lint.yml

@@ -23,14 +23,11 @@ jobs:
       - name: Install npm dependencies
         run: npm ci
 
-      - name: Run linters
-        uses: samuelmeuli/lint-action@v1
-        with:
-          github_token: ${{ secrets.github_token }}
-          eslint: true
-          eslint_dir: "src/javascripts"
-          stylelint: true
-          stylelint_dir: "src/sass"
+      - name: Eslint
+        run: npm run lint:js
+
+      - name: Stylelint
+        run: npm run lint:sass
 
       - name: Check build
         run: npm run build