[NicolasDorier]

Summary

• Replace the duplicated README procedure with a link to the shared maintenance repository.
• Remove UPDATING-LND-NOTES.md after migrating the release procedure, startup invariants and historical evidence.
• Keep source patches, Dockerfiles, startup tests and publication workflows unchanged.

Dependency and related work

Merge btcpayserver/image-maintenance#1 first so the new master links resolve. The centralized procedure incorporates the applicable corrections from #19: current overlay discovery, startup coverage against the actual published image, both downstream integration gates, artifact identity checks and generated Docker documentation. This PR changes the location of those instructions; it does not modify or close #19 or its branch.

Historical published source tags remain unchanged. Future overlay refreshes should omit the migrated maintenance notes.

Validation

• Pass git diff --check for this documentation-only change.
• Preserve all fork build, runtime and CI files unchanged.
• Validate the destination documentation links and helpers in the parent repository tests.

No new image publication, full startup run, downstream bump or live deployment was performed.

[coderabbitai]

Caution

Review failed

The pull request is closed.

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