[grade=B] Make website billing production-ready

.env.example

@@ -4,4 +4,14 @@ DASHCADDY_WEBSITE_URL=https://dashcaddy.net
 STRIPE_SECRET_KEY=sk_live_your_secret_key_here
 STRIPE_PUBLISHABLE_KEY=pk_live_your_publishable_key_here
 STRIPE_WEBHOOK_SECRET=whsec_your_webhook_secret_here
+DASHCADDY_LICENSE_SECRET=64_hex_characters_shared_with_dashcaddy
 DATA_DIR=./data
+ADMIN_TOKEN=generate_a_long_random_admin_token
+
+SMTP_HOST=mail.sami-ahmed.net
+SMTP_PORT=587
+SMTP_SECURE=false
+SMTP_USERNAME=licenses@dashcaddy.net
+SMTP_PASSWORD=your_smtp_password
+SMTP_FROM=licenses@dashcaddy.net
+SMTP_TLS_REJECT_UNAUTHORIZED=true