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

[gentlementlegen]

          @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.

[ubiquity-os-beta]

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The following contributors may be suitable for this task:

gentlementlegen

76% Match ubiquity-os-marketplace/command-start-stop#62
76% Match ubiquity-os-marketplace/command-start-stop#100

jordan-ae

76% Match ubiquity-os-marketplace/command-start-stop#8

[ubiquity-os-beta]

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[ubiquity-os-beta]

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@gentlementlegen

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@whilefoo maybe we could simplify to just `collaborator`…	8.79 content: content: p: score: 0 elementCount: 3 em: score: 0 elementCount: 1 a: score: 5 elementCount: 1 result: 5 regex: wordCount: 72 wordValue: 0.1 result: 3.79	1	2	17.58

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@whilefoo

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since admin is not in settings anymore how would one restrict a …	1.06 content: content: p: score: 0 elementCount: 1 result: 0 regex: wordCount: 16 wordValue: 0.1 result: 1.06	0.9	2	1.908
Maybe I'm missing something but for example if I set empty array…	6.9 content: content: p: score: 0 elementCount: 1 a: score: 5 elementCount: 1 result: 5 regex: wordCount: 32 wordValue: 0.1 result: 1.9	0.8	2	11.04