[Fundamentals] Added video to overview page

[dcpena]

Added What is Cloudflare video to landing page.

[hyperlint-ai]

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PR Change Summary

Added a video to the overview page to enhance user understanding of Cloudflare.

• Introduced the 'What is Cloudflare' video on the landing page
• Replaced introductory text with video render component

Modified Files

• src/content/docs/fundamentals/index.mdx

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[github-actions]

Preview URL: https://2874cc80.preview.developers.cloudflare.com
Preview Branch URL: https://dpena-add-video.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/fundamentals/	https://dpena-add-video.preview.developers.cloudflare.com/fundamentals/