Actually embed the doc

docs/docs.go

@@ -8,7 +8,7 @@ import (
 // Dir is the embedded directory containing documentation.
 // Only embed structured documentation.
 //
-//go:embed index.md how-to/*.md explanation/*.md reference/*.md
+//go:embed index.md tutorial/*.md how-to/*.md explanation/*.md reference/*.md
 var Dir embed.FS
 
 // RTDRootURL is the root url of ReadTheDoc adsys documentation.