fix(site): repair project page media on mobile

[lostmygithubaccount]

Summary

• make Markdown-rendered project images responsive inside page content
• add /imessage/ alias for the iMessage project page
• switch iMessage project metadata/include to canonical dkdc-io/imessage

Verification

• zorto build
• zorto check
• generated public/imessage/index.html exists
• generated imessage page uses absolute raw image URLs
• Playwright CLI mobile screenshots captured for /bookmarks/ and /imessage/ at 390x844

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