Delete pages that didn't make it in new structure

Our home page is the new getting started page, we are ditching a lot
of these getting started pages for their more detailed counterparts
in user-docs
[endlessm/eos-shell#3910]
New pages from Nuritzi

We are adding a bunch of new pages as part of a big restructure of
pages on the help center

Content not finished yet, some pages are still stubs.
[endlessm/eos-shell#3910]
Restructure page hierarchy

We now have a much simpler page hierarchy with 6 toplevel pages
which link to all the article pages.

Removed see also links
[endlessm/eos-shell#3910]
Merge pull request #6 from endlessm/shell/3910

Shell/3910
Fix up attributions for getting started docs

For pages only written by Nuritzi, we remove the CC-BY-SA license
put an endless copyright notice and list her as only author.

For gnome pages we have contributed too, just add Nuritzi as author
[endlessm/eos-shell#3977]
Merge pull request #7 from endlessm/shell/3977

Fix up attributions for getting started docs