Update docs for use in docs.scs.community

[DEiselt]

In an effort to integrate csctl into the SCS projects official documentation at docs.scs.community, some changes need to be made to this repo to comply with the Documentation File Structure.

The goal of this issue is to collect and track necessary changes.

Following documents need to be created / restructure in the docs directory within this repository as appropriate.

• Overview - mandatory
• Requirements - mandatory
• Quickstart - optional. If it is possible, then mandatory
• Getting Started - mandatory
• Configuration – mandatory
• Contribute – mandatory