Topic-focused guide: security

The overall tutorial already covers security setup, but doesn't go into detail about how to use the security APIs in the application.

But the tutorial is already long enough. We should create an auxiliary tutorial guide for UberFire security covering the following:

• security API nomenclature
• defining roles
• using declarative security annotations for service authorization
• using declarative security annotations for UI element visibility
• using declarative security annotations for access to Resources
• using Subject Properties
• creating a new Authentication Provider
• creating a new Authorization Provider