Problem: to guide existing customers safely, quickly, and comfortably to the new App Launcher

Fix: create a migration guide in collaboration with jalonso. Bear in mind the points below especially.

• 6.2.x - Classic default & Modern as an option (small change in YAML from client/dev)
  Have a configuration variable (e.g. layoutConfigurationMode) with 2 possible values:
  CLASSIC: New UI only. Uses the current way to configure the apps & groups. It would be the default mode for 6.2
  MODERN: New UI & New groups. The way we configure apps & groups changes: it lets us define a new grouping without affecting 6.2. This would be the default mode for 6.3 (SaaS)
• SaaS & 6.3 - Modern only
  We need to implement this for SaaS & 6.3
  We would need to change the configuration of all the apps (or maybe only of those apps that change the mapping)
• Help customers in 6.2.x to move to the “Modern” layout etc.