Add `markdown-link-check` with `pre-commit` to check for dead links in Markdown files

[jbampton]

https://github.com/tcort/markdown-link-check

https://github.com/tcort/markdown-link-check?tab=readme-ov-file#run-as-a-pre-commit-hook

- repo: https://github.com/tcort/markdown-link-check
  rev: ...
  hooks:
    - id: markdown-link-check
      args: [-q]

We will need a config file with various rules:

https://github.com/tcort/markdown-link-check?tab=readme-ov-file#config-file-format