Improve code quality

[nvtkaszpir]

Some ideas to improve code quality

• Add pre-commit to run some linters

  • makrdownlint-cli (with some exceptions because it is extremely annoying on defaults)
  • Run hack/check_urls.sh checker for runbooks urls
  • Run hack/spider.sh to check dead urls to detect.. guess what, dead urls!

• Add it to CI for more strict code quality checks (if someone does not use pre-commits... such as in web editing via GitHub)
  That may be a bit more problematic than it sounds