webpage 'Contributing to POT' outputs '404 not found' error

[thibsej]

Describe the bug

I tried to find information to contribute to the package. By clicking on the section 'Contributing to POT' of the POT package website I obtained a '404 not found error' at the following link:
https://pythonot.github.io/.github/CONTRIBUTING.html

Is there a way to restore the information available on this webpage ?
Many thanks !