Add account setup message to welcome alert after signup

client/src/app/+signup/shared/signup-success.component.html

@@ -13,4 +13,8 @@
   <p i18n>
     If you need help to use PeerTube, you can have a look at the <a href="https://docs.joinpeertube.org/use-setup-account" target="_blank" rel="noopener noreferrer">documentation</a>.
   </p>
+
+  <p i18n>
+    To help moderators and other users to know <strong>who you are</strong>, don't forget to <a routerLink="/my-account/settings">set up your account profile</a> by adding an <strong>avatar</strong> and a <strong>description</strong>.
+  </p>
 </div>