Modify auth logic to support other SuperTokens recipes and switch to using headers instead of cookies for next-app

Summary of changes

Introduced a new config property in lib/utils/config.ts called AUTH_MODE. Changing the value of this variable will change the type of authentication the app uses. Refer to comments in lib/utils/common.types.ts to know about the different modes available
Refactored supertokensUtilities.ts to switch between recipes based on the value of AUTH_MODE
Changed Session.init in next-app to use headers for authentication instead of cookies
Updated the README to explain how to switch between auth methods

Upgraded to latest version of supertokens-node
Refactored config logic to initialise the correct recipes with SuperTokens based on the value of AUTH_MODE (This change was made for the api layer of next-web)

Upgraded to the latest version of supertokens-web-js
Refactored config logic to initialise the correct recipes with SuperTokens based on the value of AUTH_MODE (This change was made for both next-web and next-app)
Refactored UI components to use a different form and functionality depending on the value of AUTH_MODE
Added UI components for Passwordless login, components only work with email + input codes for now but can be extended for magic links