[css-device-adapt] Adds motivating scenarios and rewording of intro #327
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Addresses #326
Intro reworded to discuss more of the "why" -- why current default behavior exists and why authors would want to opt-out. Added 2 scenarios -- one for fully responsive using viewport and one partially responsive using @Viewport and @media. The examples use the current syntax for now, if/when syntax changes are made they can be updated at that time.