manatee: Add dagbok

Served at dagbok.ppp.pm through nginx from 127.0.0.1:8093, with its token
from agenix, a Hetzner DNS-01 certificate, a dynamic DNS record and a
state backup snapshot.

hosts/manatee/modules/default.nix

@@ -31,6 +31,7 @@ in
       todo.enable = true;
       schema.enable = true;
       atuin.enable = true;
+      dagbok.enable = true;
     };
   };
 }