[skip changelog] Introduce linting and formatting for docs and config files

[silvanocerza]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests before creating one)
• The PR follows our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

Created new tasks to run linting and formatting on documentation and config files, Markdown and YAML files only for now.
Created Workflow to check linting of Markdown and YAML files.
Updated contributing documentation with linting and formatting instructions.
Formatted all Markdown and YAML files with newly introduced formatting configuration.

[silvanocerza]

I suggest you skip a6cceab [skip changelog] Format all docs and config files since they're only formatting changes.

[per1234]

This is really great @silvanocerza. Thanks!

I have asked for clarification on a few things. I also pointed out some places where the automatic formatting will cause issues, but I think this can be resolved.