We use markdownlint to lint the Markdown. From the root folder run:
markdownlint '**/*.md' --ignore node_modules --config .github/.markdownlint.yml
We also lint the YAML files with yamllint. From the root folder run:
yamllint -c .github/.yamllint .
https://www.npmjs.com/package/markdownlint-cli https://yamllint.readthedocs.io/en/stable/