[Images] Tutorial for lazy loading

[ToriLindsay]

Summary

Requested by Deanna.

Adding recommendation and instructions for lazy loading

[hyperlint-ai]

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PR Change Summary

Added a tutorial on lazy loading images to optimize mobile viewing.

• Introduced a new tutorial for lazy loading images on mobile devices.
• Outlined the benefits of lazy loading, including faster page load times and lower costs.
• Provided instructions on how to implement lazy loading in HTML.

Added Files

• src/content/docs/images/tutorials/optimize-images-for-mobile.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/images/	@ToriLindsay, @cloudflare/pcx-technical-writing, @renandincer, @third774

[github-actions]

Preview URL: https://adf02feb.preview.developers.cloudflare.com
Preview Branch URL: https://tori-lazy-loading-mirage-depcrecation.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/images/tutorials/optimize-mobile-viewing/	https://tori-lazy-loading-mirage-depcrecation.preview.developers.cloudflare.com/images/tutorials/optimize-mobile-viewing/