Update vale styles.

[yhontyk]

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What does this PR do?

accept.txt specifies the capitalization and form of the word that we accept in the project. Some of the items in CommonTerms duplicate it. Cleaned up the styles, added regex definitions of certain words to fix bugs.

Also, disabling Vale.Repetition rule since it cretas a lot of false positives in image and include elements. Can't figure out how to escape those for now. =\

What issues does this PR fix or reference?

Specify the version of the product this PR applies to.

Current

PR Checklist

As the author of this Pull Request I made sure that:

• vale has been run successfully against the PR branch
• Link checker has been run successfully against the PR branch
• Documentation describes a scenario that is already covered by QE tests, otherwise an issue has been created and acknowledged by Che QE team
• Changed article references are updated where they are used (or a redirect has been set up on the docs side):
  • Dashboard branding.json
  • Chectl constants.ts