chore: add next-env.d.ts for template frontend; gitignore local TLS certificates

Author: SPCFXDA

apps/template/frontend/.gitignore

@@ -0,0 +1 @@
+certificates/

apps/template/frontend/next-env.d.ts

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