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/certs/default.nix

@@ -31,6 +31,7 @@ in
       "puppy.ppp.pm"
       "todo.ppp.pm"
       "schema.ppp.pm"
+      "dagbok.ppp.pm"
     ] (_: hetznerCert);
   };