Operational technoical documentation for Bifrost and Unleasherator

[Starefossen]

Operations documentation for Bifrost and Unleasherator. High level view and how it all fits together. Add necessary references to nais/vakt.

• Bifrost
  • Development and deployment
  • Architecture and components (dependencies)
• Unleasherator
  • Development and deployment
  • Architecture and components (dependencies)
• Unleash
  • Components (dependencies)
  • Failure scenarios

[Starefossen]

https://github.com/nais/vakt/blob/master/unleash.md