feature/improved data gathering from API

src/public/scripts/exchangeRate.js

@@ -1,7 +1,6 @@
-function convert(from) {
-    fetch(`https://api.frankfurter.dev/v1/latest?base=${from}`)
-      .then((resp) => resp.json())
-      .then((data) => {
-        console.log(data);
-    });
+async function convert(from) {
+    const res = await fetch(`https://api.frankfurter.dev/v1/latest?base=${from}`);
+    const data = await res.json();
+
+    return data;
 }