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/restic/default.nix

@@ -108,6 +108,7 @@ let
     snapshot /var/lib/solo-referee         "$STATE/solo-referee"
     snapshot /var/lib/todo                 "$STATE/todo"
     snapshot /var/lib/schema               "$STATE/schema"
+    snapshot /var/lib/dagbok               "$STATE/dagbok"
     snapshot /var/lib/komga-book-manager   "$STATE/komga-book-manager"
     snapshot /var/lib/komga-reading-stats  "$STATE/komga-reading-stats"