Update installation instructions for apache
Update installation instructions for apache

The configuration file for the virtual host was copied from the one used in
docker as well as other, rather cosmetic changes.

petervanderdoes/wger,wger-project/wger,rolandgeider/wger,wger-project/wger,rolandgeider/wger,rolandgeider/wger,petervanderdoes/wger,petervanderdoes/wger,petervanderdoes/wger,wger-project/wger,wger-project/wger,rolandgeider/wger