Setup authentication in the Main Application.

[cyrildewit]

Some links:

• https://github.com/whoisryosuke/nextjs-oauth2-cookie-auth (https://whoisryosuke.com/blog)
• Nuxt.js - https://github.com/nuxt-community/auth-module
• https://github.com/zeit/next.js/tree/master/examples/with-cookie-auth-fauna
• https://github.com/AmetAlvirde/dead-simple-real-world-nextjs-app
• https://github.com/benawad/codeponder/blob/master/packages/web/modules/shared/withAuth.tsx
• https://dev.to/jolvera/user-authentication-with-nextjs-4023
• https://github.com/cornflourblue/react-jwt-authentication-example