feat(docs): add copy page markdown action to docs title

[kdcokenny]

Summary

• Add a "Copy page as markdown" action to the docs site title bar, allowing users to copy the full page content as markdown to their clipboard.

Testing

• Verified with astro build — passes with no errors.

[github-actions]

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[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search, I found a potential duplicate:

Duplicate PR Found:

• PR feat(docs): add "Copy Page as Markdown" button to doc pages #6602: "feat(docs): add 'Copy Page as Markdown' button to doc pages"
  • feat(docs): add "Copy Page as Markdown" button to doc pages #6602

This PR appears to be addressing the same feature - adding a copy-to-markdown functionality to documentation pages. PR #6602 has nearly identical functionality to the current PR #13220, both aiming to let users copy page content as markdown to their clipboard for the docs site.