The repository has migrated to https://pimachinelearning.wip.la/simple, and moved to a VPS instead of GitHub Pages.
Wheels built by PiMachineLearning as a binary repository
The default pip.conf (located at /etc/pip.conf) on a Raspberry Pi OS might look like
[global]
extra-index-url=https://piwheels.org/simple
To use these wheels, simply change it to
[global]
extra-index-url=https://piwheels.org/simple https://pimachinelearning.github.io/simple