THIS IS A DATAPACK! You need to either add it to your world's datapack folder or use an automatic loader such as OpenLoader or Paxi.
This simple datapack removes the Runic Grimoire on join. This was made because sadly it's trigger via advancements, meaning mods such as StarterKit won't work to remove it.
There is also no config option, so this is the only way as of now.
Requires Simply Swords
How to install?
Download the zip and put it in your world's datapacks folder.
Alternatively, install openloader or paxi, and put the datapack inside their data folder.