index: update link for tonc

src/index.md

@@ -7,7 +7,7 @@ This tutorial will teach you how to make games for the Game Boy and Game Boy Col
 
 While the Game Boy and Game Boy Color are almost the same console, **the Game Boy Advance is entirely different**.
 However, the GBA is able to run GB and GBC games!
-If you are looking to program GBC games and run them on a GBA, you're at the right place; however, if you want to make games specifically for the GBA, please check out [Tonc](http://coranac.com/tonc/text) instead.
+If you are looking to program GBC games and run them on a GBA, you're at the right place; however, if you want to make games specifically for the GBA, please check out the [Tonc](https://gbadev.net/tonc/) tutorial instead.
 
 :::