Demo returns with v2! And a lot of adjustments

Updated Primis to v26

• Patched floor holes in the Ice Village waterfall cave and removed misplaced blocks.,
• Set doFireTick to false to prevent fire spread and block destruction.,
• Made additional minor world adjustments.,
• (Re)added the map to the teleport room. (Requires 1.21.5),
• Updated some custom models to use new FMM hitboxes.,
• Rebalanced early adventure content for smoother progression.
  

The demo is now in v2 and goes all the way up to Gladius!