Content changes from Nuritzi

Updated the getting started pages to match Endless and not Gnome
user interactions
[endlessm/eos-shell#3909]
Removed videos from the main page

They are not accurate for endless, and we are going to add our own separate
video page
[endlessm/eos-shell#3909]
Remove respond messages page
[endlessm/eos-shell#3909]
Fix up connect accounts page

To reflect new placement of setting in our system

[endlessm/eos-shell#3909]
Added tutorial videos

The scripts are just translated with google translate and not proofed, but I
don't think english content is the focus right now.

Also the videos are all currently in Spanish

[endlessm/eos-shell#3909]
Merge pull request #2 from endlessm/shell/3909

Shell/3909