Update to r44908

[bhd]

Summary

• Describe that it's possible to install prebuilt binaries as well as build from source.
• Instructions on how to extract distfiles on 8.x & earlier / 9.0 & later
• Remove reference to jail_www_devfs_ruleset rc.conf, as-is it prevents the jail from starting because a ruleset needs to be defined & as there is no documentation for that in the article, it's easier to remove it, by doing this, the default ruleset is applied.
• Add instructions on how to keep jails up to date with freebsd-update.