Feature Request (missing/incomplete docs): Plugins Concept

[pklaschka]

Type(/-s) of missing documentation

• Explanation of a concept
• Tutorial for achieving a task with the Server State ecosystem
• Guide that explains how to use a specific tool in more detail
• Reference to quickly look something up

Description of missing documentation

Concept explaining (on a high level) what plugins are and what they can / cannot do

Additional comments

Similar to #5, just for plugins