Under "Get Started" add a section "Interactive data analysis" that outlines how to use Studios

[robnewman]

As part of Studios GA, we need a new section of the "Get Started" docs called "Interactive data analysis".

It should include how to:

1. Add a new Studio session
2. Mount data link(s)
3. Start + connect to the session
4. Share the URL with another user
5. Create a simple (and useful) plot/dashboard
6. Show that data is saved to S3
7. Stop the Studio session
8. Show checkpoints
9. Start-as-new from a checkpoint
10. Delete a Studio session

Could probably take much of @llewellyn-sl blog post about Studios and make generic.