Added a small introduction about salt.
Added the installation chapter for salt.
Added the configuration chapter for salt.
Added the remote execution chapter for salt.
adding content to networking
fixing tables.
Added some more installation details.

Not sure I should go through all the apt-get details.
Added the part explaining how to write configuration files for salt.
Indicate user and host when running commands.
Cleanup the expression.
Mention fqdn in config file.
Remove some wildcards from cli calls.
Added info on UEFI/GPT and multiuser vs singleuser runlevels
Wrote about getty
Fixed TOC issues
Fixed the typo in hyperlink.
Added a link to globbing docs.
Removed duplicated links.
Update the `cmd` module text, cleaner.
Use `uname -a` instead of `uptime` for examples.