Use root @springio/antora-extensions for docs build

See more info in: https://github.com/spring-io/antora-extensions

(cherry picked from commit 53b9469)

src/reference/antora/antora-playbook.yml

@@ -1,18 +1,9 @@
 antora:
- extensions:
- - '@springio/antora-extensions/partial-build-extension'
- - # atlas-extension must be before latest-version-extension so the latest versions are applied to imported versions
- - '@antora/atlas-extension'
- - require: '@springio/antora-extensions/latest-version-extension'
- - require: '@springio/antora-extensions/inject-collector-cache-config-extension'
- - '@antora/collector-extension'
- - require: '@springio/antora-extensions/root-component-extension'
- root_component_name: 'amqp'
- # FIXME: Run antora once using this extension to migrate to the Asciidoc Tabs syntax
- # and then remove this extension
- - require: '@springio/antora-extensions/tabs-migration-extension'
- unwrap_example_block: always
- save_result: true
+ antora:
+ extensions:
+ - require: '@springio/antora-extensions'
+ root_component_name: 'amqp'
+
 site:
  title: Spring AMQP
  url: https://docs.spring.io/spring-amqp/reference/