[Propose Update] Enable Prod-Like Test Env page and create content

[nbeck415]

Is your proposed change related to a problem? Please describe. This is just an enhancement, there's currently a draft page called "Test==Prod" that needs content.

Describe the solution you'd like I've drafted some content for this page, including "Definitions" and "What is Improved". For the initial pass, I'm including info on staging and ephemeral environments.

Describe alternatives you've considered N/A