fix(theme/style): some components should not be included in rp-doc

[SoonIter]

Summary

Related Issue

introducd in (#2579) (#2600)

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR adds the rp-not-doc CSS class to specific UI components to exclude them from documentation rendering or processing. The changes ensure that navigation elements, utility components, and interactive elements are properly marked as non-documentation content.

• Adds rp-not-doc class to Table of Contents, Source Code, and Badge components
• Updates PrevNextPage component to use inline markdown rendering for titles
• Imports renderInlineMarkdown utility function in PrevNextPage component

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
packages/theme-default/src/components/Toc/index.tsx	Adds rp-not-doc class to TOC container
packages/theme-default/src/components/SourceCode/index.tsx	Adds rp-not-doc class to source code link component
packages/theme-default/src/components/PrevNextPage/index.tsx	Imports renderInlineMarkdown and applies it to page titles
packages/theme-default/src/components/Badge/index.tsx	Adds rp-not-doc class to badge component

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