docs: add processStylexRules API documentation

[Ankitsinghsisodya]

What changed / motivation?

This addresses issue #1061 by documenting the processStylexRules API that is exported from @stylexjs/babel-plugin. This API is essential for people building custom bundler integrations or improving official integrations.

The documentation covers:

• Function purpose and usage
• Function signature with TypeScript types
• Configuration options (useLayers, legacyDisableLayers)
• Example for custom bundler integrations

Note: Per reviewer feedback, documentation was moved to the babel-plugin README (more appropriate for custom integrations) and legacy Meta-internal options (enableLTRRTLComments, useLegacyClassnamesSort) were excluded.

Linked PR/Issues

Fixes #1061

Additional Context

This is a documentation-only change. No code changes or tests required.

Files modified:

• packages/@stylexjs/babel-plugin/README.md (added processStylexRules section)
• packages/docs/content/docs/api/index.mdx (removed link)
• packages/docs/content/docs/api/configuration/meta.json (removed entry)

Files deleted:

• packages/docs/content/docs/api/configuration/processStylexRules.mdx

Pre-flight checklist

• I have read the contributing guidelines
  Contribution Guidelines
• Performed a self-review of my code

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[Copilot]

Pull request overview

This PR adds comprehensive API documentation for the processStylexRules function exported from @stylexjs/babel-plugin, addressing issue #1061. This function is essential for developers building custom bundler integrations.

Changes:

• New documentation file explaining the processStylexRules API, including function signature, configuration options, and usage examples
• Updated navigation to include link to the new documentation
• Updated meta.json to include the new page in the documentation structure

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/docs/content/docs/api/configuration/processStylexRules.mdx	Comprehensive documentation for processStylexRules API with examples and configuration options
packages/docs/content/docs/api/index.mdx	Added navigation link to processStylexRules documentation
packages/docs/content/docs/api/configuration/meta.json	Added processStylexRules.mdx to pages array for documentation structure

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[mellyeliu]

This should probably live in a section in the babel-plugin README.md instead of within the configs docs, since it’s only relevant for custom integrations.

[Ankitsinghsisodya]

@mellyeliu sir, I have done all the changes suggested by you.