update: linting tools

[codekow]

Provide a way to check spelling and markdown format in a container or using a local python env

pymarkdownlnt has the ability to fix errors and a handful of other improvements.

Why use pymarkdown?

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: codekow
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[openshift-ci]

Hi @codekow. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codekow]

The current markdown method was copied from https://github.com/openshift/enhancements

[codekow]

Using this method would help to avoid formatting errors and inconsistencies.

Please provide feedback for improvement. Thanks.

[codekow]

@simonpasquier

FYI, see above - #405 (review)