Feature Request (missing/incomplete docs): Extensions 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

To write down the proper terminology, we should create a concept for extensions (formerly: "Server Modules"), explaining (rather high-level) what they are and what they can / cannot do

Additional comments

Of course, tutorials regarding the development of such extensions, etc., are also still missing, but for now, we should (before we have the APIs set up) focus on documenting concepts