fix: respond rfc2616 sec14.9.4

src/routes/image.js

@@ -63,7 +63,6 @@ export async function get(req, event) {
     status: 200,
     headers: {
       'Content-Type': 'image/svg+xml; charset=utf-8',
-      'Cache-Control': 'max-age=0, no-cache, must-revalidate', // fix github cdn cache
     },
   });
 }