Website optimization: improve server response

The website could run faster if we improve the server response time.

The analysis for the desktop version:

The analysis for the mobile version:

More info: https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fstreetnet.org.za&tab=mobile

In mobile version, the other thing to consider is twitter timeline, because twitter doesn't compress and doesn't serve image in a proper format (webp).