add info for each param in .env.example

.env.example

@@ -4,21 +4,25 @@ URL=http://localhost:7777
 # Enable sentry
 ENABLE_SENTRY=true
 
-# DEBUG options
-RESET_DB=true
+# apply colored log
 COLOR_LOG=true
 
-# Email related settings
+# <<< Email related settings >>>
 # Only print email content, not sending it
 NOT_SEND_EMAIL=true
+# domain used to create alias
 EMAIL_DOMAIN=sl.local
+# transactional email is sent from this email address
 SUPPORT_EMAIL=support@sl.local
+# to send general stats
 ADMIN_EMAIL=admin@sl.local
 # Max number emails user can generate for free plan
 MAX_NB_EMAIL_FREE_PLAN=3
+# custom domain needs to point to these MX servers
 EMAIL_SERVERS_WITH_PRIORITY=[(10, "email.hostname.")]
 
-# Database
+# <<< Database >>>
+# delete and recreate sqlite database
 RESET_DB=true
 DB_URI=sqlite:///db.sqlite