Tiers changes

Hi, guys I decided to make some little changes in Tiers. 

Access to non-nude previews of future releases is moved from Tier 3 to Tier 2.
Access to nude previews of future releases is moved from Tier 4 to Tier 3.                        Added access to custom nude images of characters for Tier 4. I'll create them every month.

And I know that Discord channel is a bit of a mess right now. I don't know much about this stuff, so I will probably hire someone later on.  Thank you guys for all the support!