Modfest migration todo-list

[MattiDragon]

Things that need to be done while moving DemoBox under modfest:

• Move GitHub repo under ModFest organisation
• Give MattiDragon appropriate permission to manage to repository
• Move Modrinth project under ModFest organisation
• Gradle work
  • Migrate to version catalog
  • Set up mpp
  • Template fmj like other mods
  • Other buildscript cleanup
• Use standard editorconfig and gitignore
• Replace workflows with modfest standard
• Obtain and use themed logo
• Update README to reflect being maintained by ModFest