Remove pymarkdownlint

[rkratky]

As pymarkdownlint doesn't support many aspects of MyST syntax, it is more disruptive than useful. I propose removing it or drastically reducing its ruleset.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/DOCPR-2699.

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[s-makin]

+1 to this, I found it extremely noisy and not very useful

[SecondSkoll]

Isn't that part of the starter pack, rather than this repo?

[rkratky]

Eh, yes. Inconsistently so :)