Move Jitsi to a module

nixos/modules/jitsi.nix

@@ -38,6 +38,12 @@ in
         localAddress = cfg.localAddress;
       };
     };
+    environment.persistence.${config.impermanence.name} = {
+      directories = [
+        "/var/lib/jitsi-meet"
+        "/var/lib/prosody"
+      ];
+    };
   #We are behind a reverse proxy that handles TLS
     services.nginx.virtualHosts."${cfg.hostName}" = {
       enableACME = false;