Upgrade antora

.gitignore

@@ -29,5 +29,5 @@ artifacts
 node
 node_modules
 build
-package.json
+/package.json
 package-lock.json

docs/antora-playbook.yml

@@ -1,13 +1,7 @@
 antora:
   extensions:
-    - '@springio/antora-extensions/partial-build-extension'
-    - require: '@springio/antora-extensions/latest-version-extension'
-    - require: '@springio/antora-extensions/inject-collector-cache-config-extension'
-    - '@antora/collector-extension'
-    - '@antora/atlas-extension'
-    - require: '@springio/antora-extensions/root-component-extension'
+    - require: '@springio/antora-extensions'
       root_component_name: 'cloud-stream'
-    - '@springio/antora-extensions/static-page-extension'
 site:
   title: Spring Cloud Stream
   url: https://docs.spring.io/spring-cloud-stream/reference/
@@ -36,4 +30,4 @@ runtime:
     format: pretty
 ui:
   bundle:
-    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.11/ui-bundle.zip
+    url: https://github.com/spring-io/antora-ui-spring/releases/download/v0.4.15/ui-bundle.zip

docs/package.json

@@ -0,0 +1,10 @@
+{
+	"dependencies": {
+		"antora": "3.2.0-alpha.4",
+		"@antora/atlas-extension": "1.0.0-alpha.2",
+		"@antora/collector-extension": "1.0.0-alpha.3",
+		"@asciidoctor/tabs": "1.0.0-beta.6",
+		"@springio/antora-extensions": "1.11.1",
+		"@springio/asciidoctor-extensions": "1.0.0-alpha.10"
+	}
+}

docs/pom.xml

@@ -66,7 +66,7 @@
 						<artifactId>antora-component-version-maven-plugin</artifactId>
 					</plugin>
 					<plugin>
-						<groupId>io.spring.maven.antora</groupId>
+						<groupId>org.antora</groupId>
 						<artifactId>antora-maven-plugin</artifactId>
 					</plugin>
 <!--					<plugin>-->