manatee: Fetch schema from gitea

Point the schema input at its repo instead of a local path, so the
config builds from anywhere.

flake.nix

@@ -100,9 +100,8 @@
     };
 
     schema = {
-      # Switch to the gitea URL once the repo is pushed there:
-      # url = "git+ssh://gitea@git.ppp.pm:1122/alex/schema.git?ref=main";
-      url = "path:/home/alex/code/schema";
+      url = "git+ssh://gitea@git.ppp.pm:1122/alex/schema.git?ref=main";
+      # url = "path:/home/alex/code/schema";
       inputs.nixpkgs.follows = "nixpkgs";
     };