There is a new CDN url on unpkg. It's apparently not fully updated yet, as the twemoji.min.js there still references maxcdn as baseurl for the individual images, but they'll probably fix that soon.
The PR also adds the ability to configure your own sphinxemoji_source to use your own CDN or possibly store it as local files in the projects repository similar to other js and css files.
MaxCDN is defunct: https://github.com/twitter/twemoji/issues/580
There is a new CDN url on unpkg. It's apparently not fully updated yet, as the twemoji.min.js there still references maxcdn as baseurl for the individual images, but they'll probably fix that soon.
The PR also adds the ability to configure your own
sphinxemoji_source
to use your own CDN or possibly store it as local files in the projects repository similar to other js and css files.