fix for Distro: Arch

[junglert]

• While trying to install shc on Manjaro Arch i got following errors:
  package apache2 apache2-mod_php7 not found

  to fix this the script has to install:
  sudo pacman -Sy apache php-apache php

• While enabling apache2 the script exited with an error:
  no module named apache2

  to fix this the script needs to enable httpd:
  sudo systemctl enable httpd

• The script could not move the index.php file to the designated location because Arch uses a different structure