onboarding: clarify vaultwarden + mail setup

frontend/src/views/OnboardingView.vue

@@ -150,7 +150,8 @@
             </label>
             <p class="muted">
               Open <a href="https://vault.bstein.dev" target="_blank" rel="noreferrer">Passwords</a> and set a strong master
-              password you won't forget.
+              password you won't forget. If you can't sign in yet, check your Atlas mailbox in
+              <a href="https://cloud.bstein.dev" target="_blank" rel="noreferrer">Nextcloud Mail</a> for the invite link.
             </p>
           </li>
 
@@ -279,7 +280,8 @@ const extraSteps = [
   {
     id: "vaultwarden_browser_extension",
     title: "Install the Vaultwarden browser extension",
-    description: "Install Bitwarden in your browser and point it at your Atlas vault for autofill.",
+    description:
+      "Install Bitwarden in your browser and point it at vault.bstein.dev (Settings → Account → Environment → Self-hosted).",
     primaryLink: { href: "https://bitwarden.com/download", text: "Bitwarden downloads" },
     secondaryLink: { href: "https://vault.bstein.dev", text: "Passwords" },
   },
@@ -305,7 +307,8 @@ const extraSteps = [
   {
     id: "mail_client_setup",
     title: "Set up mail on a device",
-    description: "Use the IMAP/SMTP details on your Account page to add mail to your phone or desktop client.",
+    description:
+      "Use the IMAP/SMTP details on your Account page to add mail to your phone or desktop client (Thunderbird, Apple Mail, Outlook, etc).",
     primaryLink: { href: "/account", text: "Account" },
   },
 ];