Adds URL to AUR page 

Adds URL to AUR ansile page
Adds suggestion to symlink python to python2 since most Arch users have
python3 by default. This suggestion might not be wise, though it doesn't
seem to break anything.
It might be probably wiser to have a patch for the AUR build that takes
care of this.

that makes some sense.  Should put Ansible first in the html TITLE, need to investigate
Sphinx details

Adds doc for apt modules

Fixes typo in apt/update-cache blurb

Documents update-cache and puge apt module options

Describe selinux functionality in file module

Fix small typo