Extra cache control

gemini/EN/install.gmi

@@ -114,6 +114,9 @@ And paste the following:
             proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forward-Proto http;
             proxy_set_header X-Nginx-Proxy true;
+            expires 7;
+            proxy_set_header Pragma public;
+            proxy_set_header Cache-Control "public";
             proxy_temp_file_write_size 64k;
             proxy_connect_timeout 10080s;
             proxy_send_timeout 10080;