add user account deletion (right to be forgotten)

app/templates/users/delete_page.html

@@ -0,0 +1,15 @@
+{% extends 'base.html' %}
+{% block title %}delete confirmation{% endblock %}
+{% block content %}
+<div class="darkbg login-container">
+  <h1>Confirm account deletion</h1>
+  <p>Are you sure you want to delete your account on {{ config.SITE_NAME }}? <strong>This action is irreversible.</strong> Your posts and threads will remain accessible to preserve history but will be de-personalized, showing up as authored by a system user. Posts that @mention you will also mention the system user instead.</p>
+  <p>If you wish for any and all content relating to you to be removed, you will have to ask {{ config.SITE_NAME }}'s administrators separately.</p>
+  <p>If you are sure, please confirm your current password below.</p>
+  <form method="post">
+    <label for="password">Confirm password</label>
+    <input type="password" id="password" name="password" required autocomplete="current-password">
+    <input class="critical" type="submit" value="Delete account">
+  </form>
+</div>
+{% endblock %}