docs: rewrite for people running nxdns; query-history refusals name their remedy and a refused start gives no wrong hints

CHANGELOG.md

@@ -4,6 +4,17 @@ All notable changes to nxdns are recorded here. The format follows [Keep a Chang
 
 Sections are written by hand. Nothing here is generated from commit messages: the point of the file is to say what changed for an operator, which a commit subject rarely does.
 
+## [Unreleased]
+
+### Fixed
+
+- **A refused query history says what to do.** When nxdns refuses to open `querylog.db`, because a newer release wrote it or it cannot be converted, the message now gives the remedy: run the newer release again, put back the `querylog.db.pre-migrate-*` copy, or move the file and its `-wal` and `-shm` files aside to start an empty history. It used to point at a documentation page.
+- **A refused start no longer gives advice that does not apply.** After a query history refusal, `nxdns run` also printed "run `nxdns check`" and "load one with `nxdns import <file>`", though the configuration was fine. The import hint now appears only when the database has no usable upstream, and neither hint follows a database refusal.
+
+### Changed
+
+- **The documentation is written for people running nxdns.** It starts from Get started, which downloads a release instead of building from source, and drops the API reference, the troubleshooting page and the performance pages. It is published at <https://nxdns.sh/docs/>, and `INSTALL.md` in the tarball links there.
+
 ## [0.0.24] - 2026-10-21
 
 ### Fixed