Configure different navigation for Antora assembler output

Author: marcphilipp

documentation/antora.yml

@@ -3,6 +3,7 @@ version: true
 title: JUnit
 nav:
   - modules/ROOT/nav.adoc
+  - modules/ROOT/extra-site-nav.adoc
 ext:
   collector:
     run:
@@ -22,6 +23,9 @@ ext:
     - dir: ./build/plantuml
       clean: true
       into: modules/ROOT/images
+  assembler:
+    nav:
+      - modules/ROOT/nav.adoc
 asciidoc:
   attributes:
     javadoc-root: "xref:attachment$api"

documentation/modules/ROOT/extra-site-nav.adoc

@@ -0,0 +1 @@
+* {javadoc-root}/index.html[Javadoc]

documentation/modules/ROOT/nav.adoc

@@ -63,4 +63,3 @@
 * xref:api-evolution.adoc[]
 * xref:release-notes.adoc[]
 * xref:appendix.adoc[]
-* {javadoc-root}/index.html[Javadoc]