Integrate Markdown linting

[JanssenBrm]

To ensure a consistent writing quality, it would be nice to integrate the markdownlint-cli through the pre-commit configuration. This integration has been tested in #24, but it requires a full refactor of most files so it deserves its own ticket.

  - repo: https://github.com/igorshubovych/markdownlint-cli
    rev: v0.42.0
    hooks:
      - id: markdownlint
        types: [file]
        files: \.(md|qmd)$
        args: [ "--fix" ]

To configure the plugin, create a .markdownlint.yaml file and paste the following content.

default: true
line-length:
  line_length: 120
  code_blocks: false
  tables: false