[Pages, Workers] Add Workers for Platforms limit tooltips

[MattieTK]

Summary

Adds hover-enabled footnotes to the Pages and Workers limits documentation so users who need higher project or Worker limits can find Workers for Platforms.

Screenshots (optional)

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-workers-and-pages]

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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/pages/	@cloudflare/workers-docs, @GregBrimble, @WalshyDev, @aninibread, @irvinebroque, @cloudflare/product-owners, @MattieTK
/src/content/docs/workers/	@cloudflare/workers-docs, @GregBrimble, @irvinebroque, @mikenomitch, @korinne, @WalshyDev, @cloudflare/deploy-config, @cloudflare/product-owners, @cloudflare/wrangler, @MattieTK, @cloudflare/dev-plat-leads, @vy-ton, @cloudflare/workers-runtime-1

[cloudflare-docs-bot]

Review

✅ No issues found in commit f2a5184.

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