Add netlify functions and connect it to mongodb.

[netlify[bot]]

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[pavel-kubik]

Broke routing: https://stackoverflow.com/questions/44491184/react-router-does-not-work-in-production-and-surge-deployments

Solution for netlify: https://answers.netlify.com/t/netlify-page-not-found-when-sharing-react-router-dom-based-links/11744/5