feat(llm): include shared content components in documentation

  - Add extraction and rendering of MdxSharedContent components
  - Preserve original JSX examples (e.g., <Polymorphic />, <GetElementRef />)
  - Include educational content from AutoContrast, Gradient, InputFeatures, etc.
  - Handle component-specific props (withVariant, refType, element)
  - Convert MDX component output to markdown format
  - Fix escape character issues in JSX rendering

  This follows the conventional commit format with:
  - Type: feat (new feature - adding content that wasn't included before)
  - Scope: llm (the LLM documentation generation scripts)
  - Description: Clear summary of what was added
  - Body: Bullet points detailing the specific changes

Author: brookton