update neovim and syncthing

Signed-off-by: gwg313 <gwg313@pm.me>

hosts/candlekeep/syncthing.nix

@@ -62,6 +62,18 @@
             };
           };
         };
+
+        "zettelkasten" = {
+          path = "/home/gwg313/zettelkasten/";
+          devices = [ "grymforge" ];
+          versioning = {
+            type = "staggered";
+            params = {
+              cleanInterval = "3600";
+              maxAge = "15768000";
+            };
+          };
+        };
       };
     };
   };