get-started: bad /doc/tutorials/deep link in index

[jorgeorpinel]

This link by the end of the Get Started index is broken:

See #666 (comment) for more context.

[jorgeorpinel]

Should probably review wording and linking of all old mentions to the tutorial, now in /tutorials/tutorial. Maybe rename the path /tutorials/long too?

[jorgeorpinel]

Never mind. It seems I caught the engine in the process of deploying Ivan's new version. (See #666 (comment))