Module not found errors in 'Structured data' page

[K-Meech]

The Structured data page shows errors in all of the YAML output blocks. e.g.

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
Cell In [10], line 1
----> 1 import yaml

ModuleNotFoundError: No module named 'yaml'

[dpshelio]

🤔 that requires pyyaml.... but it's not in any of the two requirements.txt files we've got. How that happened 🤷
We probably want it in https://github.com/UCL-RITS/doctoral-programming-intro/blob/main/requirements.txt so it's the same as for https://github.com/UCL/rsd-engineeringcourse/blob/main/requirements.txt#L21