Create a section "how to use hanami in production"

[davydovanton]

After 1to1 with @jodosha I learn that hanami s command is only for development and for production is better to use puma .... I think we have more than one tip for hanami in production that's why I suggest to create a separate area in guides and call it Hanami in production or something like this.

[adam12]

Document disabling of code reloading since it causes strange benchmark results.