[dev-overlay] minify css (#76370)
### Why?
Our internal comments in the css literal templates, are being shipped to
the client along with the dev overlay, which is a bad practice.
https://github.com/vercel/next.js/blob/7f5a1d39e8a94b0b424ef9538be9dd2802e6ccb6/packages/next/src/client/components/react-dev-overlay/ui/components/errors/error-overlay-bottom-stack/index.tsx#L104-L107
### How?
Added minifying css util that includes removing comments.
| Before | After |
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- Renamed `noop` util to `css`.
- Added minifying in `css` util.
- Added unit test for `css` util.
- Removed unnecessary `css` util usage as it's only required for the
entry point (where it injects to `<style>` tag).
- Updated README (will follow up to improve).
Note: This loses the benefit of VS Code extension
`styled-components.vscode-styled-components`, so dropping it from
recommendations.
| Before | After |
|--------|--------|
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Closes NDX-750
Closes NDX-839
