chore(gitignore): Add next-env.d.ts to ignore list

frontend/.gitignore

@@ -7,3 +7,4 @@ dist/
 
 # clerk configuration (can include secrets)
 /.clerk/
+next-env.d.ts

frontend/next-env.d.ts

@@ -1,6 +0,0 @@
-/// <reference types="next" />
-/// <reference types="next/image-types/global" />
-import "./.next/types/routes.d.ts";
-
-// NOTE: This file should not be edited
-// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.