src: don't add cache headers

Investigating why staging always falls back to the origin for directory
listings after #125, this will _hopefully_ fix things

Sentry ref: https://nodejs-org.sentry.io/issues/5799625624/

Signed-off-by: flakey5 <73616808+flakey5@users.noreply.github.com>

src/middleware/cacheMiddleware.ts

@@ -50,13 +50,10 @@ export function cached(middleware: Middleware): Middleware {
       if (!wasDeferred && response.status === 200) {
         // Successful request, let's cache it for next time
         const cachedResponse = response.clone();
-        cachedResponse.headers.append('x-cache-status', 'hit');
 
         ctx.execution.waitUntil(cache.put(request, cachedResponse));
       }
 
-      response.headers.append('x-cache-status', 'miss');
-
       return response;
     },
   };