Edit README.md

• Please check this box if this contribution uses AI-generated content (including content generated by GitLab Duo features) as outlined in the GitLab DCO & CLA. As a benefit of being a GitLab Community Contributor, you receive complimentary access to GitLab Duo.

This update improves the Antora documentation for better clarity and usability.

Added inline code formatting for commands

Linked directly to the contributing guide

Clarified OS-specific installation instructions

Expanded troubleshooting steps with --stacktrace usage

Updated section header for clearer communication guidance