docs: overhaul README into a presentational open-source landing doc

[Rayan9064]

Add banner, badges (license, CI, stack), table of contents, and a Platform section covering the browser extension, REST API, MCP server, and mobile share sheet — all shipped since the original README was written but never mentioned there. Corrected env var list to match what's actually used (removed unused RESEND_FROM_EMAIL, added RESEND_INBOUND_WEBHOOK_SECRET and Dodo vars) and linked the already-existing but previously unlinked CONTRIBUTING.md / CODE_OF_CONDUCT.md.

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Project	Deployment	Actions	Updated (UTC)
dumpit	Ready	Preview	Aug 7, 2026 4:39pm

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• README.md

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