Next-auth - Add JWT to Token

[jberns]

• Add JWT encode/decode to both client and server
• Add authentication to non-logged in routes (client)
• Add authentication to non-logged in requests (server)
• Test social provider (i.e. github login)

https://hasura.io/blog/next-js-jwt-authentication-with-next-auth-and-integration-with-hasura/
https://vizzuality.github.io/devismos/docs/researches/next-auth/