CMS-46781 Adding missing HTML elements: option, thead, tfoot, and caption.

[TRomesh]

• Add more tags that would be needed for table and select.

[Copilot]

Pull Request Overview

This PR enhances the rich text renderer by adding support for additional HTML table and form elements, and reorganizes the documentation for better clarity.

• Adds missing table elements (thead, tfoot, caption) and form element (option) to the element type map
• Restructures documentation to consolidate supported elements into a single, categorized list
• Removes the separate "Built-in Element Support" section in favor of the unified list in the "Available Element Types" section

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
packages/optimizely-cms-sdk/src/components/richText/renderer.ts	Adds option, thead, tfoot, and caption elements to the defaultElementTypeMap for complete table and form support
docs/6.1-richtext-component-react.md	Consolidates and reorganizes element documentation into categorized lists, removes redundant "Built-in Element Support" section, and documents newly added elements

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