Set up local environment to be like production

[AlexITC]

The goal is that our local environment is as similar to production as possible, we have been previously hit by some issues that can't be reproduced locally, for example:

1. Server-sent events were not being propagated to the frontend because nginx was trying to buffer the whole response.
2. We experienced a weird issue once, where a GET /path url wasn't working in production due to some issue with nginx but it worked locally

Then, let's focus on:

1. Use nginx as the entry point for backend/frontend (I already have a draft for this).
2. Use SSL, https://github.com/FiloSottile/mkcert seems ideal.

I'd expect that:

1. We get to a super simple setup so that everyone uses it.
2. Update docs to use this approach.