Add UK West and UK South regions to tier-3 in the cost calculator and…

[kuthiala]

… publish docs

Proposed changes

Write a clear and concise description that helps reviewers understand the purpose and impact of your changes. Use the
following format:

Problem: This PR announces support for UK West and UK South regions for NGINXaaS for Azure.

Solution: Explain the approach you took to implement the solution, highlighting any significant design decisions or
considerations.

Testing: Describe any testing that you did.

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specific feedback, add them here.

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Closes #ISSUE

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[github-actions]

✅ All required contributors have signed the F5 CLA for this PR. Thank you!
_{Posted by the CLA Assistant Lite bot.}

[kuthiala]

I have hereby read the F5 CLA and agree to its terms

[russokj]

Approved, except I can't. (@jputrino)

[mjang]

Merging, based on 2nd "implied" approval from @russokj