feat: send an email when a domain has been modified

templates/emails/domain_updated.html.twig

@@ -0,0 +1,14 @@
+<p>
+    Hello,<br />
+    <br />
+    We are pleased to inform you that a new action has been detected on a domain name in your watchlist.<br />
+    Domain name : <b>{{ event.domain.ldhName }}</b><br />
+    Action : <b>{{ event.action.value }}</b><br />
+    Effective Date : <b>{{ event.date | date("c") }}</b><br />
+    <br />
+    <br />
+    Thank you for your understanding,<br />
+    Sincerely<br />
+    <br />
+    Domain Watchdog
+</p>