Add: about; Update: .env.example, how env is loaded

frontend/.env.example

@@ -1,19 +1,2 @@
-# Since the ".env" file is gitignored, you can use the ".env.example" file to
-# build a new ".env" file when you clone the repo. Keep this file up-to-date
-# when you add new variables to `.env`.
-
-# This file will be committed to version control, so make sure not to have any
-# secrets in it. If you are cloning this repo, create a copy of this file named
-# ".env" and populate it with your secrets.
-
-# When adding additional environment variables, the schema in "/src/env.js"
-# should be updated accordingly.
-
-# Drizzle
-# Get the Database URL from the "prisma" dropdown selector in PlanetScale. 
-# Change the query params at the end of the URL to "?ssl={"rejectUnauthorized":true}"
-DATABASE_URL='mysql://YOUR_MYSQL_URL_HERE?ssl={"rejectUnauthorized":true}'
-
-# Example:
-# SERVERVAR="foo"
-# NEXT_PUBLIC_CLIENTVAR="bar"
+NEXT_PUBLIC_SERVER_MODE="dev" # dev or release
+NEXT_PUBLIC_PROD_API_SERVER="https://api.reroll.ing" # https://your.remote.server