fix: remove outdated reference to older changelogs in README.md

Author: H5N1v2

README.md

@@ -303,7 +303,6 @@ After a new adapter update, it is recommended to delete the entire directory tre
 ### 2.6.3 (2026-03-26)
 * (H5N1v2) add sentry plugin to automatically report errors to developer
 
-[Older changelogs can be found there](CHANGELOG_OLD.md)
 
 ## Older Changelog
 [OLDER CHANGELOG](CHANGELOG_OLD.md)