Add UK carbon tax and dividend analysis blog post (#2759)

* add blog post

* name edit

* edit number

* Address PR review feedback for UK carbon tax post

- Move post to beginning of posts.json (most recent first)
- Change "blog post" to "report" in introduction
- Add "In this policy experiment" to second paragraph
- Define poverty as absolute before housing costs
- Remove "under both scenarios" from description
- Remove "significant" from geographical variation description
- Define "largest gains/losses" as share of net income

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Co-Authored-By: Claude <noreply@anthropic.com>

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Co-authored-by: Max Ghenis <mghenis@gmail.com>
Co-authored-by: Claude <noreply@anthropic.com>

Author: 3 people