Create comprehensive documentation on how to use the tool in different scenarios

[zzap]

Scenarios:

• new version release (field guide, changelog, code reference, GH issues)
• new project start (setup project, CI)
• existing project (setup project, CI, code reference, changelog, GH issues)
• multiple GH repositories

Docs need:

• dependencies
• record workflows (videos) - transcripts
• how-to's (per docs type, per scenario)
• code reference (of the parser)
• extending the parser
• contributing to parser