Cache extra AP objects (#6349)

* Cache extra AP objects

* Cache nodeinfo

src/server/activitypub/featured.ts

@@ -37,6 +37,6 @@ export default async (ctx: Router.RouterContext) => {
 	);
 
 	ctx.body = renderActivity(rendered);
-	ctx.set('Cache-Control', 'private, max-age=0, must-revalidate');
+	ctx.set('Cache-Control', 'public, max-age=180');
 	setResponseType(ctx);
 };