readd broken assetUrl helper

src/config.ts

@@ -40,3 +40,8 @@ export function isMobileViewport() {
     const width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
     return width < 1200;
 }
+
+export function assetUrl(file: string) {
+    return process.env.PUBLIC_URL + '/' + file;
+    // return `/techradar/assets/${file}`
+}