Set up appropriate Teams

[matthiasbeyer]

Part of #1385 Depends on #1388

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To reflect the team organization we agreed upon in #1203 we have to reorganize the team structure. That includes what teams should exist, how are the hierarchies (if any) and also who is part of what team.

[TheNeikos]

I think as a preliminary setup, the following teams can be created:

• Core Maintainers (Didier and myself)
  • Cumulocity (@didier-wenzek you'd get to nominate whoever you see fit here)

Everyone else would get removed from any teams, and those teams deleted.

Not exactly sure on the naming of the subgroups, but that can be changed later anyway.

[didier-wenzek]

For the moment it is not a priority