Have basic newsletter subscribe form working

packages/website/ts/utils/fetch_utils.ts

@@ -20,6 +20,18 @@ export const fetchUtils = {
         const result = await response.json();
         return result;
     },
+
+    async postAsync(baseUrl: string, path: string, body: object): Promise<Response> {
+        const url = `${baseUrl}${path}`;
+        const response = await fetch(url, {
+            method: 'POST',
+            headers: {
+                'Content-Type': 'application/json',
+            },
+            body: JSON.stringify(body),
+        });
+        return response;
+    },
 };
 
 function queryStringFromQueryParams(queryParams?: object): string {