README: landing banner back at the top

[drk1rd]

Restores the landing-page banner (docs/images/landing.png, linking to homecloud.pages.dev) above the pitch, as before the README rewrite.

[coderabbitai]

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Reviewing files that changed from the base of the PR and between f403ea6 and 654df2b.

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• README.md

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< Assembling the Avengers to fight your bugs. >
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