feat(webapp): advertise MFA on home page

www/webapp/src/views/Home.vue

@@ -354,6 +354,13 @@ export default {
                + ' bulk operations. It is <a href="https://desec.readthedocs.io/en/latest/dns/domains.html" target="_blank">well-documented</a> '
                + ' and easily integrates into your scripts, tools, or CI/CD pipeline.',
       },
+      {
+        href: '#',
+        icon: 'mdi-two-factor-authentication',
+        title: 'Multi-Factor Auth (2FA)',
+        text: 'Accidentally shared your password with someone? Enable MFA to <b>keep your account safe</b>. We '
+              + 'currently support <b>TOTP tokens</b> (Authenticator app), with WebAuthn in the making.',
+      },
       {
         href: '#',
         icon: 'mdi-database-arrow-up',