Tell people not to be the BOFH.

This is a start to the "how not to be a sysadmin" section. I've tried to
achieve some balance between useful guidance and preaching.
content for airco, security in datacenters

Filled some content for review
Added description of 'kill' command.
Formatting, syntax-highlighting, additional example, and link for shell_tools_101.
Merged my changes into soft_skills after grabbing the latest files
fixing errors
fixing errors
fixing errors
Merge pull request #67 from tyler/add_kill_description

Added description of 'kill' command.
fixed stuff Mike identified and added a bit more
fixed the hyperlinks
Merge remote-tracking branch 'upstream/master' into soft_skills
soft skills: corrected list indentation
soft skills: use Amazon short url
soft skills: trailing whitespace
Add some basic ansible stuff and also some thoughts about organization
for the 101 section.  Good start, like this idea.
Adding section on how to become an operations engineer
converting to internal links
How to navigate the filesystem
added a new top level learning topic