#428: Introduce pre-commit-hooks and mdformat hooks

Moulrequested to merge
418_428_pre-commit-hooks_mdformat_insert_license into main
  • Add common job to group/gather minors hooks
    • Run insert-license
  • Apply mdformat
  • Add mdformat pre-commit hook
  • Apply pre-commit-hooks hooks
  • Add pre-commit-hooks hooks selection

Close #418 (closed), #428 (closed).

Edited by Moul

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