P0: adjust administrator quickstart to orchestration only

[hisImminence]

Improve the administrator quickstart with the main focus on kind (install of helm covered in the helm section).

@leiicamundi started via

• https://github.com/camunda/team-infrastructure-experience/issues/880
• draft PR: refactor(docs): restructure administrator quickstart and kind setup camunda-docs#6943

[hisImminence]

This ticket is now a duplicate of the linked above - but will keep it open for tracking for now

[hisImminence]

This ticket is now a duplicate of the linked above - but will keep it open for tracking for now

Actually not. Will close this one.