chore: unify response payload across all template configs

Signed-off-by: Thorsten Hans <[email protected]>

Author: ThorstenHans

templates/http-js/content/src/index.js.tmpl

@@ -31,7 +31,7 @@ let router = AutoRouter();
 // Any route that does not return will be treated as a middleware
 // Any unmatched route will return a 404
 router
-    .get("/", () => new Response("hello universe"))
+    .get("/", () => new Response("Hello, Spin!"))
     .get('/hello/:name', ({ name }) => `Hello, ${name}!`)
 
 addEventListener('fetch', (event) => {