add local Antora playbook for previewing the content as an HTML site offline

.gitignore

+/.cache/
+/public/

README.adoc

@@ -9,8 +9,8 @@ This documentation has been submitted as the initial contribution for the {url-a
 == Documentation Structure
 
 This repository is a registered content source in the {url-org}/docs.asciidoctor.org/blob/main/antora-playbook.yml[playbook file for docs.asciidoctor.org].
-The source files are organized into a documentation component as described by the _antora.yml_ file.
-To learn how to build this documentation using the playbook and Antora, see the https://docs.antora.org/antora/2.3/install-and-run-quickstart/[Install and Run Antora Quickstart].
+The source files are organized into a documentation component as described by the [.path]_antora.yml_ file.
+To learn how to build this documentation using the playbook file [.path]_local-antora-playbook.yml_ with Antora, see the https://docs.antora.org/antora/2.3/install-and-run-quickstart/[Install and Run Antora Quickstart].
 
 == Copyright and License
 

local-antora-playbook.yml

+# This is a configuration file for Antora.
+# You can pass it to Antora to build this content as an HTML site for previewing offline.
+#
+#  $ antora --clean local-antora-playbook.yml
+#
+# A copy of this documentation is also available online at https://asciidoctor-docs.netlify.app/asciidoc/current/
+runtime:
+  cache_dir: ./.cache/antora
+site:
+  title: AsciiDoc
+  start_page: asciidoc::index.adoc
+git:
+  ensure_git_suffix: false
+content:
+  sources:
+  - url: .
+    branches: HEAD
+  # ...or use this content source instead to pull the content directly from the repository
+  #- url: https://github.com/asciidoctor/asciidoc-docs
+  #  branches: main
+asciidoc:
+  attributes:
+    page-pagination: ''
+    experimental: ''
+    idprefix: '@'
+    idseparator: '-@'
+    table-caption: false
+    example-caption: false
+    listing-caption: false
+    hide-uri-scheme: '@'
+    url-org: https://github.com/asciidoctor
+ui:
+  bundle:
+    url: https://gitlab.com/antora/antora-ui-default/-/jobs/artifacts/master/raw/build/ui-bundle.zip?job=bundle-stable
+    snapshot: true
+output:
+  dir: ./public