Migrate to automatic README translation

Is your feature request related to a problem? Please describe.

Keeping the documentation up to date and managing the PRs would be more manageable if we switched from manual to automatic README translations (see https://github.com/dephraiim/translate-readme). The downside is that there might be some errors, but this shouldn't matter for understanding how to use GRS. Google has become quite good at translating languages in the last few years. The upside is that we no longer need to look at translation PRs, we can support more language, and the translations are up to date. We can add flags to the readme for people to choose their language.