refactor: activity proof s3 link

Author: pbc1017

front/src/components/activity/ActivityProof/ActivityProof.tsx

@@ -20,9 +20,7 @@ export const ActivityProof = ({
   onDelete,
 }: Props): JSX.Element => {
   const isImage = url?.match(/\.(jpeg|jpg|gif|png|PNG|JPG|JPE|GIF)$/) != null;
-  const proxyUrl = url
-    ? `${process.env.REACT_APP_BACKEND_URL}/activity/image-proxy?url=${url}`
-    : "";
+  const proxyUrl = url ? url : "";
 
   const handleDelete = () => {
     if (onDelete && fileName) {