Properly cache html files

nginx.conf

@@ -39,7 +39,7 @@ http {
     # Expires map
     map $sent_http_content_type $expires {
         default                    off;
-        text/html                  epoch; # We don't cache the html for the browser to get the content
+        text/html                  max;
         text/css                   max;
         application/javascript     max;
         ~image/                    max;