docs: add link to documentation for creating custom world presets

Author: NonSwag

content/docs/worlds/manage/create.mdx

@@ -73,6 +73,9 @@ The following presets are available by default:
 - `redstone-ready` - [A redstone ready world.](https://minecraft.wiki/w/Superflat#Default_presets)
 - `the-void` - [A void world.](https://minecraft.wiki/w/The_Void)
 
+Want to learn how to create your own presets?  
+Check out the [Creating a world preset](/docs/worlds/presets) documentation.
+
 ### Example
 
 Void world example: