[Suggestion]Let startpage's button-icon support playerhead and custommodeldata

**Minecraft version**
1.18

**Plugin version**
3.65

**Describe the bug**
Not a bug,just a suggestion .let the icon support player-head or custommodeldata.The menu can be made more beautiful. 

Or make the shop's close-button can open  my custom menu which made by other plugins
**To Reproduce**
Null

**Expected behavior**
