Stanford guide links are broken

[priyansh32]

Describe the bug
The links to Stanford Design Thinking Guide and Design Thinking model are broken.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://lmkeston.github.io/empathy-dev/five-phases/
2. Click on 'Stanford’s Design Thinking Model' or 'Stanford Design Thinking Process Guide '
3. Link does not open

Expected behavior
Open expected Pdfs

Smartphone (please complete the following information):

• Device: Mi Notebook 14
• OS: Windows 10
• Browser : Edge
• Version : 93.0.961.47 (Official build) (64-bit)

Additional context
Stanford site seems to have moved to a new domain. I have found other working links to it.
https://web.stanford.edu/~mshanks/MichaelShanks/files/509554.pdf

I would like to fix this issue.