* Simple replacements of doc.zebra.zfnd.org with docs.rs
* Manual fixes for specific main/internal/external docs
* Point developer docs to doc-internal.zebra.zfnd.org
* fastmod --glob '\!.git' -- doc.zebra.zfnd.org/zebrad docs.rs/zebrad/latest/zebrad
* Manually remove any remaining doc.zfnd.zebra.org links
* Remove the external docs job
* Add changelog entry and fix links
* Fix links that were broken before this PR
* Use correct release for getblocktemplate config
* Include at least 2 full checkpoints in the lookahead limit
* Increase full sync timeout to 36 hours
* Only log "synced block height too far ahead of the tip" once
* Replace AboveLookaheadHeightLimit error with pausing the syncer
* Use AboveLookaheadHeightLimit for blocks a very long way from the tip
* Also add the getblocktemplate config, and fix the test message
* Remove an outdated TODO comment
* Allow syncing again when a small number of blocks are in the queue
* Allow some dead code
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