docs: update dpp spec to v0.6.0
Created by: ashleythedeveloper
This PR updates the DPP specification page to align with the v0.6.0 data model.
NOTE: The external example DPP (link, QR code) will be updated at a later date.
The changes include:
- Update external inks to point to v0.6.0 artefacts (DPP and UNTP Core)
- Update the image of the data model
- Update property names to align with v0.6.0
- Update JSON examples to align with v0.6.0
- Add two additional sections (ProductPassport and Due Diligence Declaration)
- Tweaks to the descriptions