Fix path

modules/ROOT/pages/index.adoc

@@ -2,10 +2,9 @@
 = Preface
 Stefan Wintermeyer <[email protected]>
 
-Learning <<elixir/index.adoc, Elixir>>, <<phoenix/index.adoc, Phoenix>>
-and <<ash/index.adoc, Ash>> is a steep climb. No sugar-coating. This
-book aims to make that ascent less steep. It's a guide crafted for
-beginners.
+Learning /elixir/[Elixir], /phoenix/[Phoenix] and /ash/[Ash] is a
+steep climb. No sugar-coating. This book aims to make that ascent
+less steep. It's a guide crafted for beginners.
 
 * *A step-by-step guide.* While no prior knowledge is required, a basic
 understanding of programming and HTML will be beneficial.