services: remove prololo beta testing service

secrets/default.nix

@@ -20,10 +20,5 @@ with lib;
     restic-backup = import ./restic-backup { inherit lib; };
 
     matrixEmailConfig = import ./matrix-email-config.nix;
-
-    prololo_password = lib.fileContents ./prololo-password.secret;
-    prololo_room = lib.fileContents ./prololo-room.secret;
-    prololo_room2 = lib.fileContents ./prololo-room2.secret;
-    prololo_github_secret = lib.fileContents ./prololo-github-secret.secret;
   };
 }