GPDR checklist

[evilcel3ri]

Inspired from here

• updated version of our ToS @hugoroy
• allow user to delete their data (still a work in progress, I've started something there but hasn't finished it) @piks3l WIP: allow user deletion of account #335
• allow user to export all its data (maybe we could make it a cool way to export user's point and contributions ?)

[michielbdejong]

I'm unassigning myself to indicate that I'm not currently working on this issue.