Create Guides section

[guillaumebriday]

Why?

Because most of configuration are the same and I think it might help lot of developer to be getting on board with these few exemples and we could add some in the future.

I put few accessories examples here, but we could add some Dockerfile, cmd on hosts (like bundle exec sidekiq), Traefik configurations and so on.

Preview 🚀

Here is what it looks like:

Inspired by https://github.com/basecamp/kamal-site/pull/32