feat: refactored configs to follow modules pattern

flake.nix

@@ -106,13 +106,6 @@
             default = {};
           };
         })
-        ({...}: {
-          flake.syncthingConfiguration = inputs.nix-syncthing.lib.syncthingConfiguration {
-            modules = [
-              (import ./configurations/syncthing)
-            ];
-          };
-        })
         (inputs.import-tree ./modules)
       ];
     };