Discord account linking + Patreon perks

[Roudenn]

Ported discord account linking and patreon perks from RMC
Right now it doesn't work because of some weird Json document crash and I ahve no idea what causes this

Fixes #36

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[github-actions]

This pull request has been automatically marked as stale because it has not had
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If you'd like to keep this open, just leave any comment, and the stale label will be removed.

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