New tier and visual rework (Patreon)

Several of you have told me that they don't really care about receiving stickers.

The "Demon" tier has been created for those who want to support me without Patreon sending you anything, and without Patreon taking a cut of the payment for sticker production, which means a bit more support for me!

Thank you all so much! And I hope you like the tier redesign!