Update .env.example comments (#90)

.env.example

@@ -9,8 +9,8 @@ AUTH_SECRET=XXXXXXXX
 AUTH_GITHUB_ID=XXXXXXXX
 AUTH_GITHUB_SECRET=XXXXXXXX
 # Support OAuth login on preview deployments, see: https://authjs.dev/guides/basics/deployment#securing-a-preview-deployment
-# Set the following only when deployed. We recommend using a different OAuth app for development/production.
-# AUTH_REDIRECT_PROXY_URL=https://auth.example.com/api/auth
+# Set the following only when deployed. In this example, we can reuse the same OAuth app, but if you are storing users, we recommend using a different OAuth app for development/production so that you don't mix your test and production user base.
+# AUTH_REDIRECT_PROXY_URL=https://YOURAPP.vercel.app/api/auth
 
 # Instructions to create kv database here: https://vercel.com/docs/storage/vercel-kv/quickstart and 
 KV_URL=XXXXXXXX

auth.ts

@@ -1,6 +1,5 @@
 import NextAuth, { type DefaultSession } from 'next-auth'
 import GitHub from 'next-auth/providers/github'
-import { NextResponse } from 'next/server'
 
 declare module 'next-auth' {
   interface Session {
@@ -14,7 +13,7 @@ declare module 'next-auth' {
 export const {
   handlers: { GET, POST },
   auth,
-  CSRF_experimental
+  CSRF_experimental // will be removed in future
 } = NextAuth({
   providers: [GitHub],
   callbacks: {
@@ -26,10 +25,10 @@ export const {
       return token
     },
     authorized({ auth }) {
-      return !!auth?.user
+      return !!auth?.user // this ensures there is a logged in user for -every- request
     }
   },
   pages: {
-    signIn: '/sign-in'
+    signIn: '/sign-in' // overrides the next-auth default signin page https://authjs.dev/guides/basics/pages
   }
 })