replaced mailer library, added email templates (#1462)

.env.dist

@@ -2,8 +2,6 @@
 # Copy this file to .env file for development, create environment variables when deploying to production
 # https://symfony.com/doc/current/best_practices/configuration.html#infrastructure-related-configuration
 
-MAILER_FROM=kimai@example.com
-
 ###> symfony/framework-bundle ###
 APP_ENV=prod
 APP_SECRET=change_this_to_something_unique
@@ -19,13 +17,18 @@ APP_SECRET=change_this_to_something_unique
 DATABASE_URL=sqlite:///%kernel.project_dir%/var/data/kimai.sqlite
 ###< doctrine/doctrine-bundle ###
 
-###> symfony/swiftmailer-bundle ###
-# For Gmail as a transport, use: "gmail://username:password@localhost"
-# For a generic SMTP server, use: "smtp://localhost:25?encryption=&auth_mode="
-# Delivery is disabled by default via "null://localhost"
-MAILER_URL=null://localhost
-###< symfony/swiftmailer-bundle ###
-
 ###> nelmio/cors-bundle ###
 CORS_ALLOW_ORIGIN=^https?://localhost(:[0-9]+)?$
 ###< nelmio/cors-bundle ###
+
+### Email configuration
+# SMTP: smtp://localhost:25?encryption=&auth_mode=
+# Google: gmail://username:password@default
+# Amazon: ses://ACCESS_KEY:SECRET_KEY@default?region=eu-west-1
+# Mailchimp: mandrill://KEY@default
+# Mailgun: mailgun://KEY:DOMAIN@default
+# Postmark: postmark://ID@default
+# Sendgrid: sendgrid://KEY@default
+# Disable emails: null://null
+MAILER_URL=null://null
+MAILER_FROM=kimai@example.com