remade folder structure, fixed problem with build

lib/next-auth.d.ts

@@ -4,6 +4,7 @@ declare module "next-auth" {
   interface Session {
     refresh_token: string;
     access_token: string;
+    expires_in: string;
   }
 }
 
@@ -13,6 +14,6 @@ declare module "next-auth/jwt" {
   interface JWT {
     refresh_token: string;
     access_token: string;
-    exp: number;
+    expires_in: string;
   }
 }