change app workflow

[colearendt]

The current dynamic-classroom (living on an orphaned fork at present) has a flow similar to:

• shiny sessionid recorded
• type password for classroom
• enter name / email
• prompt for cookie acceptance
• cookie placed
• if server assigned, provide server

Need to add the following steps:

• allow the user to select "have you been here before?"
• based on that pivot:
  • if been here before and not found: error. Are you sure you entered the same information?
  • if not been here before and not found: allocate server / do the server assignment

[colearendt]

This is added and in #25 . Ultimately, we should map out a diagram of the user flow... I have a sketchy sketch... 😮