pingo/issues/shift-opinionated-render-to-pingo.go/description

Shift opinionated render code from tui.go to cmd/pingo.go

For the sake of modular design (and the sake of bubble publishing), it would make sense to shift all the viewport/header/footer code to cmd/pingo.go.

This change enables a smoother bubble/consumer build separation. Theoretically, it should be relatively easy to "import" and extend the code as a bubble into the tui