[backoffice] react.js vs next.js

[thiennn]

react-keycloak/react-keycloak-examples#11

SSR look complicated. For the backoffice actually we don't need ssr, there is no official way to disable ssr in next.js.

We should go back to regular react.js?

[thiennn]

We finally go with nextjs and we do not handle token authentication in nextjs but normal cookie authentication with backoffice-bff