Remove code snippet on regions page and replace with upfront list of regions for users

[Kemi-Elizabeth]

Where on docs.platform.sh should be changed?

https://docs.platform.sh/development/regions.html#region-location

What exactly should be updated?

On https://docs.platform.sh/development/regions.html#region-location
We really shouldn't be needing to tell customers "If you want to see what your region is, run this.."
platform api:curl regions | jq '.regions[] | select(.available) | .id + ": " + .provider.name + " - " + .zone + " - " + .timezone' | sort
Probably best to just list the regions directly. Running this command also requires the person to have an account already, and the CLI installed. Instead of telling them "run this really long command that only works on linux" (or OS that our cli, jq, and sort supports), we should just make it up front with them on a page instead.

Additional context

See this Slack thread for context.