Fix: typo in README

Author: Daksh Yadav

go.mod

@@ -3,7 +3,7 @@ module github.com/layer5io/digitalocean-academy
 go 1.24.5
 
 // Uncomment line below when testing changes to the academy theme
-// replace github.com/layer5io/academy-theme v0.1.9 => ../academy-theme
+replace github.com/emphor/academy-theme v0.1.9 => ../academy-theme
 
 replace github.com/FortAwesome/Font-Awesome v4.7.0+incompatible => github.com/FortAwesome/Font-Awesome v0.0.0-20241216213156-af620534bfc3