Small update on tiers (Patreon)

As they were not very popular, I decided to simplify the tiers by removing the TRADER tiers (1, 2, 3).

For those being currently subscribed to one of those tiers, you'll remain subbed until you decide to rescind the subscription.

New patrons won't be able to sub to one of those tiers now.

I think it will clean the sub page a bit more, as it was beginning to feel a bit crowded.