refactor: consolidate docs/development and reorganize docs/hop

Folder Organization (Ideas #4 and #5):
- Move docs/development/TESTING.md → docs/testing/TESTING.md
- Remove empty docs/development/ directory
- Move docs/hop/ → docs/guides/hop/
- Create docs/guides/ for better semantic grouping

Updates:
- PROJECT-HUB.md: Update TESTING.md path
- IDEAS.md: Mark ideas #4 and #5 as completed
- docs/guides/hop/COPY-INSTRUCTIONS.md: Update path references

Rationale:
- TESTING.md fits better in docs/testing/ (alongside test docs)
- docs/development/ was redundant (only had one file)
- docs/guides/hop/ clarifies it's a guide, not core docs
- Better semantic organization

Impact:
- Clearer documentation structure
- Reduced directory clutter
- Easier navigation

Part of folder organization quick wins.

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: Data-Wise