linter: link hackery for divoc fallback

lib/LintConfig.hs

@@ -182,7 +182,7 @@ expandWorlds config = config { configUriSchemas = configUriSchemas' }
     assemblysubsts =
       DomainSubstitution (M.fromList generated) ["map"]
       where generated = configAssemblies config
-              <&> \slug -> (slug, "/@/"<>configEventSlug config<>"/"<>slug)
+              <&> \slug -> (slug, "/_/general/"<>configEventSlug config<>"/"<>slug)
 
 instance (FromJSON (LintConfig a)) => Argument (LintConfig a) where
   parseArgument str =

lib/Properties.hs

@@ -683,7 +683,9 @@ unwrapPath str f = case parsePath str of
       else complain $ "cannot acess paths \"" <> str <> "\" which is outside your repository."
   NotAPath -> complain $ "path \"" <> str <> "\" is invalid."
   AbsolutePath -> forbid "absolute paths are disallowed. Use world:// instead."
-  UnderscoreMapLink -> forbid "map links using /_/ are disallowed. Use world:// instead."
+  UnderscoreMapLink -> suggest "we know there's been some confusion about links; but you can \
+                               \still use world:// instead of /_/ (though the latter is now also \
+                               \allowed to keep maps working)"
   AtMapLink -> forbid "map links using /@/ are disallowed. Use world:// instead."
   PathVarsDisallowed -> forbid "extended API variables are not allowed in asset paths."