Simplify role limits by grouping all the roles under "collaborator" and "contributor"

[shiv810]

          @whilefoo maybe we could simplify to just `collaborator` and `contributor`, and then map a group of roles to these two? Admin would just have no limits. I can do that in a secondary pull-request. @ 0x4007 rfc

Originally posted by @ gentlementlegen in #116 (comment)

To simplify the roles and avoid a long and complex configuration, we should regroup roles under collaborator (anyone with write access or from the organization) and contributor (everyone else). Admins should have no limits.

[test-app-ubo]

Note

The following contributors may be suitable for this task:

gentlementlegen

74% Match ubiquity-os-marketplace/command-start-stop#62

jordan-ae

73% Match ubiquity-os-marketplace/command-start-stop#8

devpanther

71% Match ubiquity/ubiquibot#288

[shiv810]

/@ShivTestOrg solve this issue

[shiv810]

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