Update Angular submodule: Organize documentation into docs folder

Documentation files reorganized with descriptive numbered titles:
- Developer guides (00-0x)
- Architecture and planning (01-0x)
- Feature implementation plans (02-06)
- Implementation summaries and template guides (07-09)

Added comprehensive docs/README.md as documentation index

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: workcontrolgit