Remove the box link on the home page for video tutorials

We now have the video thumbnails and the "More..." link. So its not
mainly redundant
[endlessm/eos-shell#4073]
Merge pull request #5 from endlessm/shell/4073

Remove the box link on the home page for video tutorials
Update getting started links

For our restructure of all the help docs.

And remove see also links to getting started pages.
[endlessm/eos-shell#3910]