Remove references to non-existent man pages

[flyingrobots]

Part of Documentation Cleanup tasks.

Description

Documentation contains references to man pages that haven't been created yet. These references should be removed or updated to indicate future availability.

Tasks

• Search documentation for man page references
• Remove or update references appropriately
• Add note about future man page availability if needed
• Update documentation to reference CLI help instead

Files to Check

• docs/README.md
• docs/cli/*.md
• Any installation documentation

Acceptance Criteria

• No broken man page references
• Documentation provides alternative help sources
• Clear indication if man pages are planned
• Users can find help without man pages

Notes

• Man pages are tracked in issue Create man pages for all commands #77 for future implementation
• Until then, users should use git-mind --help

Related to TASKLIST.md line 239.