Blake Erickson d26aa6e71e REFACTOR: Cleanup rake tasks based on feedback
Follow up to: [FEATURE: Create a rake task for destroying categories][1]

- `Discourse.system_user` is my friend
- Remove puts statements from rake tasks that don't return anything
- `for_each` is also my friend
- Use `human_users` to also exclude discobot
- Sort/format categories:list

[1]: 092eeb5ca3
2019-07-18 19:15:01 -06:00
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