https://medium.com/@albertcito/different-layouts-with-react-router-1311a21a2df5
https://tylermcginnis.com/react-router-route-config/ https://reacttraining.com/react-router/web/example/route-config https://www.npmjs.com/package/react-router-config
https://reacttraining.com/react-router/web/example/url-params https://reacttraining.com/react-router/web/example/animated-transitions https://tylermcginnis.com/react-router-url-parameters/
remix-run/react-router#892 remix-run/react-router#1102
https://stackoverflow.com/questions/32261441/component-does-not-remount-when-route-parameters-change
https://medium.freecodecamp.org/beginners-guide-to-react-router-4-8959ceb3ad58 https://github.com/ReactTraining/react-router
https://manavsehgal.com/create-basic-navigation-components-using-react-router-475bc55a517f
https://github.com/ReactTraining/react-router/tree/master/packages/react-router-config
https://reacttraining.com/react-router/core/guides/testing
nested routes https://stackblitz.com/edit/react-router-dom-4-nested-example?file=index.js https://stackoverflow.com/questions/41474134/nested-routes-with-react-router-v4
https://tylermcginnis.com/react-router-nested-routes/
https://medium.com/@marxlow/simple-nested-routes-with-layouts-in-react-router-v4-59b8b63a1184
https://dev.to/nodefiend/quick-start-guide-for-react-router-v4-using-create-react-app-4h7j
https://egghead.io/lessons/react-run-the-react-router-v4-examples-with-create-react-app
https://facebook.github.io/create-react-app/docs/adding-a-router
https://medium.com/tech-tajawal/react-router-v4-in-minutes-b839d35f66f1