docs(pie-docs): DSW-2178 add diagram to engineering Contributing Page

[leksaBoiko]

Describe your changes (can list changeset entries if preferable)

• [Docsite] add diagram to engineering Contributing Page

Author Checklist (complete before requesting a review)

• I have performed a self-review of my code
• I have reviewed the Docs site preview
• If there are visual test updates, I have reviewed them properly before approving

Reviewer checklists (complete before approving)

Reviewer 1 - @siggerzz

• I have reviewed the Docs site preview
• If new links have been added, I have tested them in the preview
• If there are visual test updates, I have reviewed them

Reviewer 2

• I have reviewed the Docs site preview
• If new links have been added, I have tested them in the preview
• If there are visual test updates, I have reviewed them

[changeset-bot]

⚠️ No Changeset found

Latest commit: 79c7a6a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[pie-design-system-bot]

	Fails
🚫	You have unchecked checklist items outside the "Not-applicable Checklist items" section. Please ensure all unchecked checkboxes are moved to the appropriate section.
🚫	You have unchecked checklist items in Reviewer 1's section. Please ensure all items are addressed before approval.
🚫	You have unchecked checklist items in Reviewer 2's section. Please ensure all items are addressed before approval.

Generated by 🚫 dangerJS against 79c7a6a