Simple Hotbar

• Updated pack.mcmeta file to add support for 1.21.4

Updated pack.mcmeta to support versions from 1.20.2 to 1.21.3

So no one was going to tell me that second slot of the hotbar was missing a whole row of pixels on the left side?

• Main version is now 1.20
• HD Title deleted from the pack, so it will not have any incompatibilities