Bundle Javadoc with Antora

- Remove javadoc related tasks from root project
- Add aggregated javadoc task to spring-shell-docs
- Various antora version updates
- Bundle javadoc via collector into antora build
- Remove refs to distZip in workflows
- Relates #1132

spring-shell-docs/modules/ROOT/nav.adoc

@@ -96,4 +96,5 @@
 ** xref:appendices/debugging/index.adoc[]
 ** xref:appendices/tui/index.adoc[]
 *** xref:appendices/tui/viewdev.adoc[]
-*** xref:appendices/tui/catalog.adoc[]
+*** xref:appendices/tui/catalog.adoc[]
+* xref:attachment$api/java/index.html[Javadoc,role=link-external,window=_blank]