* gnu/home/services/symlink-manager.scm (update-symlinks-script): Remove 'config-home', which is unused. Move 'home-path', 'backup-dir', 'get-target-path', 'get-backup-path', 'directory?', 'empty-directory?', 'symlink-to-store?', and 'backup-file' to the top level. Move 'create-symlinks' and 'cleanup-symlinks' to the top level as well, and add parameters. Adjust callers.