- lock version to latest release of Antora 3.1
- rename properties on extension block
- use Node.js version provided by plugin
- remove package.json file
- assign environment variables using environments property on extension block
- use single quotes where possible in build script
- use default setting for log format
* remove unused workflows, scripts, and configuration (now handled by docs-build branch)
* upgrade Antora to 3.1 (and Node.js to 16)
* tune playbook settings
* reconfigure docs build for local build only
* add patch to support using linked worktree as Antora content source
* remove Antora extensions not needed for local builds