adding videos page to r2

[jason-cf]

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• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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

Added a new videos page to the R2 documentation, featuring an introduction to Cloudflare R2 and its capabilities.

• Created a new 'Videos' page in the R2 documentation.
• Included a link card for the 'Introduction to R2' tutorial.
• Organized the sidebar to include the new videos page.

Added Files

• src/content/docs/r2/video-tutorials.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/r2/	@oxyjun, @elithrar, @jonesphillip, @aninibread, @harshil1712, @cloudflare/workers-docs, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://8557a4c7.preview.developers.cloudflare.com
Preview Branch URL: https://r2-update.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/r2/video-tutorials/	https://r2-update.preview.developers.cloudflare.com/r2/video-tutorials/