Add CLI guide to documentation (#1797)
* Add CLI guide
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* write tokens
* remove tip
* add space download example
* Feedback from @julien-c
* feedback from @julien-c
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
