Proposal - Internationalization

[hdost]

Conversation inspired by https://github.com/prometheus/docs/issues/2059 we want to start looking at how we can make internationalization possible on prometheus docs

• (Potentially unrelated) Do we want to migrate off of nanoc?
• Should there be owners for languages?
• How do we deal with URLs: /en/something should be changeable to /fr/something or /de/something to work
• How do we deal with missing translations?
• We could model things a bit off of Kubernetes

Translations:

• [ ] #2059