CI: Simplify lint job (#174)

Author: marcoieni

.github/workflows/ci.yml

@@ -46,11 +46,6 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
-      - name: Lint all files in current directory
-        uses: avto-dev/markdown-lint@v1
-        with:
-          config: '.markdownlint.yaml' 
-          args: '*.md'
       - name: Lint all files recursively
         uses: avto-dev/markdown-lint@v1
         with: