Rename index.mdx to index.md

[Paul-masingah]

Summary

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

[windsurf-bot]

Looks good to me 🤙

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PR Change Summary

Renamed the documentation file from index.mdx to index.md to standardize file extensions.

• Renamed index.mdx to index.md for consistency in documentation file formats.

Renamed Files

• src/content/docs/turnstile/get-started/index.md

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[Paul-masingah]

Looks great