Shell/3910

Restructure help center content.

[endlessm/eos-shell#3910]
I guess Nuritzi was just doing this to remove clutter.

Its be kinda painful to back out all the comment deletions she did, so I think I might just leave them in.

We diverged so significantly from upstream that I don't think a rebase is really something we'll be doing. We'll probably just grab specific sections and articles that we like from upstream if we continue to take from there.