User Story: Different Views

As a **user** I want an **option to sort my board by different categories** in order to **see what is important in a certain situation**.


for now:
- [ ] sort option (see user story)
- [ ] github table view

later we can make more

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### Housekeeping
- [ ] model updated
- [ ] tests added
  - [ ] tests green
- [ ] coding style checked
- [ ] doku checked
