tutorials: replace `dvc pull` example in deep tut

[jorgeorpinel]

The Pulling data from the cloud deep tutorial code example doesn't work because https://github.com/dmpetrov/new_tag_classifier had been deleted. It's been restored now but the S3 remote is also gone so dvc pull fails.

We should probably just use a completely different project as example here (and not directly in Dmitry's account) instead of restoring the bucket, as the example is not really tied to the larger tutorial anyway?

cd command is also missing here, but being addressed in #931.

[shcheklein]

we might either delete that last section of the tutorial, or switch it indeed to the example-get-started like was suggested