Add prefill with query params

apps/web/pages/signup.tsx

@@ -448,13 +448,15 @@ export const getServerSideProps = async (ctx: GetServerSidePropsContext) => {
   // no token given, treat as a normal signup without verification token
   if (!token) {
     return {
-      props: {
+      props: JSON.parse(
+        JSON.stringify({
           ...props,
           prepopulateFormValues: {
             username: preFillusername || null,
             email: prefilEmail || null,
           },
-      },
+        })
+      ),
     };
   }