feat: add user settings page (change username/password) and remove public registration

app/templates/login.html

@@ -16,6 +16,5 @@
         </label>
         <button type="submit" class="btn btn-primary">登录</button>
     </form>
-    <p class="auth-link">没有账号？<a href="/register">注册</a></p>
 </div>
 {% endblock %}