Set AsciIDoctor options in config.

archetypes/default.adoc

@@ -9,9 +9,3 @@ tags:
 - 
 toc: false
 ---
-
-:source-highlighter: pygments
-:idprefix:
-:experimental: true
-:toc:
-:toclevels: 2

config.toml

@@ -88,6 +88,15 @@ defaultContentLanguageInSubdir = false
     startLevel = 2
     endLevel = 4
     ordered = false
+  [markup.asciidocExt]
+    backend = "html5"
+    extensions = []
+    [markup.asciidocExt.attributes]
+      source-highlighter = "pygments"
+      idprefix = ""
+      experimental = true
+      toc = true
+      toclevels = 2
 
 [languages]
     [languages.en]