feat(docs): add DIKW to EKGF section to enable reuse page (#25)

- Add 'From DIKW to EKGF: Making Knowledge Executable' section
- Explain how EKGF Method extends DIKW model with operational dimension
- Include DIKW revised diagram showing path to executable knowledge
- Add image asset (dikw-revised.svg) to docs/assets/
- Remove old screenshot files that are no longer needed
- Fix merge conflict markers in enable-reuse.md

Author: jgeluk