The sbx-cli layout had no handling for the experimental: true field
present in many data/sbx_cli/*.yaml files. Add visual indicators
matching the Docker CLI layout:
- Command-level (experimental: true at YAML root): magenta callout
block below the summary table
- Flag-level (experimental: true on an option): violet badge before
the flag description in Options and Global options tables
- Subcommands table: violet badge alongside the synopsis for
experimental child commands
The title heading stays plain, consistent with cli.html, which signals
experimental status only through the command-level callout.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>