(#583) Publish main.css as a main-legacy.css for Redesign Support

[adriancofie]

• npm install --save-dev postcss-prefix-selector

• Create the script for creating the legacy css. Create this as scripts/generate-cgdp-legacy.js

• Change the "build": "node scripts/build.js"

  See: https://github.com/NCIOCPL/cgov-react-app-playground/issues/50

  Closes #583

[github-actions[bot]]

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