Bundle Javadoc with Antora documentation site.

Closes #3128

src/main/antora/antora-playbook.yml

@@ -3,8 +3,7 @@
 # The purpose of this Antora playbook is to build the docs in the current branch.
 antora:
   extensions:
-    - '@antora/collector-extension'
-    - require: '@springio/antora-extensions/root-component-extension'
+    - require: '@springio/antora-extensions'
       root_component_name: 'data-commons'
 site:
   title: Spring Data Reference
@@ -17,13 +16,12 @@ content:
       worktrees: true
 asciidoc:
   attributes:
-    page-pagination: ''
     hide-uri-scheme: '@'
     tabs-sync-option: '@'
-    chomp: 'all'
   extensions:
     - '@asciidoctor/tabs'
     - '@springio/asciidoctor-extensions'
+    - '@springio/asciidoctor-extensions/javadoc-extension'
   sourcemap: true
 urls:
   latest_version_segment: ''
@@ -33,5 +31,5 @@ runtime:
     format: pretty
 ui:
   bundle:
-    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.3.3/ui-bundle.zip
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.16/ui-bundle.zip
     snapshot: true

src/main/antora/antora.yml

@@ -10,3 +10,8 @@ ext:
         local: true
       scan:
         dir: target/classes/antora-resources/
+    - run:
+        command: ./mvnw package -Pdistribute
+        local: true
+      scan:
+        dir: target/antora

src/main/antora/modules/ROOT/nav.adoc

@@ -31,3 +31,6 @@
 ** xref:repositories/populator-namespace-reference.adoc[]
 ** xref:repositories/query-keywords-reference.adoc[]
 ** xref:repositories/query-return-types-reference.adoc[]
+
+* xref:attachment$api/java/index.html[Javadoc,role=link-external,window=_blank]
+* https://github.com/spring-projects/spring-data-commons/wiki[Wiki,role=link-external,window=_blank]