Deploying docs with CI is broken. We are using https://github.com/rust-lang/mdBook/pull/1306 to support translations, but the action we use does not support this. **Questionnaire** <!-- If you feel up to the challenge, please check one of the boxes below: --> - [x] I'm interested in fixing this myself but don't know where to start - [ ] I would like to fix and I have a solution - [ ] I don't have time to fix this right now, but maybe later