Update Tutorial.md

[jkmarx]

• Ref Home Page Rev 1 #2680

Needs to be updated:

• Removal of collaboration page
• New dashboard
• New location for explorer (old launch page)

[jkmarx]

@gmnelson Is this used to generate https://stemcellcommons.github.io/cscb-website/ and is it worth trying to update in this milestone?

[gmnelson]

@jkmarx The tutorial is now generated from https://github.com/stemcellcommons/cscb-website/blob/gh-pages/_tutorial/01_tutorial.md. That version also needs updating but, as it's independent from this codebase, I guess it doesn't need to be formally attached to a release.