integrate asciidoctor-tabs (PR #82)

https://github.com/asciidoctor/asciidoctor-tabs

Author: abelsromero

antora-playbook.yml

@@ -64,6 +64,8 @@ content:
     branches: release
     start_path: docs
 asciidoc:
+  extensions:
+    - '@asciidoctor/tabs'
   attributes:
     page-component-order: '!ROOT, *, pdf-converter, epub3-converter, reveal.js-converter, maven-tools, gradle-plugin, asciidoclet, diagram-extension, browser-extension, about'
     page-pagination: ''

netlify/package.json

@@ -3,6 +3,7 @@
   "description": "Asciidoctor Docs (Production and Deploy Previews)",
   "private": true,
   "devDependencies": {
+    "@asciidoctor/tabs": "1.0.0-beta.6",
     "antora": "3.1.8",
     "netlify-plugin-checklinks": "git+https://github.com/mojavelinux/netlify-plugin-checklinks.git#patched"
   },