Send 2fa email and move user to waiting page when they need to re-validate email access

app/templates/views/re-validate-email-sent.html

@@ -0,0 +1,24 @@
+{% extends "withoutnav_template.html" %}
+{% from "components/page-footer.html" import page_footer %}
+
+{% block per_page_title %}
+  {{ title }}
+{% endblock %}
+
+{% block maincolumn_content %}
+
+<div class="grid-row">
+  <div class="column-two-thirds">
+    <h1 class="heading-large">{{ title }}</h1>
+    <p>For security reasons we need to check if you still have access to your email.
+    Hence, we have emailed you a link to sign in to Notify.</p>
+    <p>If your email address has changed, ask a member of your team to update your email address. Then click re-send.</p>
+    <p>Clicking the link will open Notify in a new browser window, so you can close this one.</p>
+    {{ page_footer(
+      secondary_link=url_for('main.email_not_received'),
+      secondary_link_text='Not received an email?'
+    ) }}
+  </div>
+</div>
+
+{% endblock %}