feat: add credentials authentication (#1)

.env.example

@@ -9,13 +9,7 @@ DB_URL='FULL_PATH_TO_YOUR_SQLITE_DB_FILE'
 
 # @see https://next-auth.js.org/configuration/options#nextauth_url
 AUTH_URL='http://localhost:3000'
-AUTH_REDIRECT_PROXY_URL="http://localhost:3001/api"
 
 # You can generate the secret via 'openssl rand -base64 32' on Unix
 # @see https://next-auth.js.org/configuration/options#secret
 AUTH_SECRET='supersecret'
-
-# Preconfigured Discord OAuth provider, works out-of-the-box
-# @see https://next-auth.js.org/providers/discord
-AUTH_DISCORD_ID=''
-AUTH_DISCORD_SECRET=''