next.js v9 and react-bootstrap setup and correct navigation and routing

I spent some time to figure out how to setup next.js and a ui framework: react-bootstrap correctly, making sure that the navigation also works as expected.
It was not straightforward, so I thought it'd make sense to create a quick video and share the solution. Let me know what you think.

Links:
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https://react-bootstrap.github.io/get...
https://nextjs.org/docs#importing-css...
https://github.com/zeit/next-plugins/...
https://material-ui.com
https://ant.design

software versions used:
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next.js v. 9
react-bootstrap v 1.0.0-beta 14 (Bootstrap 4.3)