should add "Collectibles workshop" to nav items

[zzz6519003]

Is there an existing issue?

• [X] I have searched the existing issues

Experiencing problems? Have you tried our Stack Exchange first?

• [X] This is not a support question.

What browsers are you seeing the problem on?

No response

Bug report for the website

https://docs.substrate.io/tutorials/collectibles-workshop/

Steps to reproduce the problem

No response