Remove pages/api/proxy.js as it was an open proxy

- The only location pages/api/proxy was used was for icon loading in item.jsx, simply returning the icon URL instead worked just fine.  There was no need to proxy icon requests.

fixes: #327

src/components/services/item.jsx

@@ -10,7 +10,7 @@ import { SettingsContext } from "utils/contexts/settings";
 
 function resolveIcon(icon) {
   if (icon.startsWith("http")) {
-    return `/api/proxy?url=${encodeURIComponent(icon)}`;
+    return icon;
   }
 
   if (icon.startsWith("/")) {