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