Feature/pre commit documentation

[killermoehre]

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)

Doc update about pre-commit.

• What is the current behaviour? (You can also link to an open issue here)

Not working pre-commit integration.

• What is the new behaviour (if this is a feature change)?

Instructions on how to get this working with pre-commit.

• Other information:

Supersedes #581

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