Add visuals for proving + privacy workflows (Docs)

Feedback:
Logic and account structure felt intuitive, but the proving workflow and privacy flow were harder to follow. More diagrams/visuals would make it much clearer.

Ask:
Add diagrams or step-by-step visuals to docs that explain:

- How the proving workflow fits together
- How the privacy flow works in practice

Why:
Makes the workflows easier to grasp, especially for new devs.

**This feedback came through DevRel applications.**