More aggressive caching (#288)

docker/nginx.conf

@@ -97,6 +97,8 @@ http {
 
             # Cache these responses too
             proxy_cache takahe;
+            # Cache after a single request
+            proxy_cache_min_uses 1;
             proxy_cache_key $takahe_realuri;
             proxy_cache_valid 200 304 720h;
             proxy_cache_valid 301 307 12h;