fix: add Vale linting

[darrickyong]

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Description

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This PR adds vale as a Github Action and initial vale config.

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Testing

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Checklist

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[mikemimik]

🤔 The output of the vale action is a little different than I expected. I thought that it would be similar to the terminal output you showed me @darrickyong when implementing this. My expectation was that the action would fail, not pass, and I'm curious why that is.

[hazel-nut]

let's move the vale config back to the a4aa directory while it's only applying to a4aa docs. the github action is handy! have you looked into using reviewdog to leave inline PR comments?

[github-actions]

Full Github Actions output