Rewards update (Patreon)

I decided to merge 3$ and 5$ reward, as it seems more appropriate to me. And I think that little amount of pledges is more pleasant for eyes.

Also I decide to separate lineart reward and lineart-base with shades, as the last one shouldn't cost less than the flat-colored character.

And finally I puzzled out the big pledges - deleted all unnecessary stuff and left only things that can interest people :)