Clarify the role of stylelint in our development process

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The following discussion from !20010 (merged) should be addressed:

• @psimyn started a discussion: (+1 comment)

  should we also mention stylelint? I don't actually know what to say about it though as we are seemingly using both

Deliverable:

We use stylelint as part of our development tooling, however it is never mentioned in the docs. We should explain:

• how to run the linter against a local environment
• when it would be appropriate to add an exception
• how to add an exception