Issue on page /day1a_Python_Introduction/readme.html: video link shows an error message

On my system, clicking the link to the "screwing_up_conda_environments.mp4" shows an error message:
<img width="305" alt="image" src="https://user-images.githubusercontent.com/1308449/201048048-8aac0432-4754-4218-b994-2acc977180cf.png">

