How to remove sign in popup from Magento 2 checkout page?

Magento2 has this authentication pop up on checkout page, which many store owners wont like to see on their checkout page.

Background of this pop up area and Related files

The pop up itself is generated by Magento_Customer::account/authentication-popup.phtml

But this pop up works very differently on checkout page. In fact this is a separate pop up than the one you see in header area. It is embedded in a series of js files which are governed by knockout-js

Other file responsible is: vendor/magento/module-checkout/view/frontend/web/js/proceed-to-checkout.js

Here is how to remove it finally

Edit file or overload the file

app/design/frontend/YourVendor/YourTheme/Magento_Checkout/web/template/onepage.html

delete the following lines and save the file

<!-- ko foreach: getRegion('authentication') -->
<!-- ko template: getTemplate() --><!-- /ko -->
<!--/ko-->

Reference:

https://github.com/magento/magento2/blob/2.2/app/code/Magento/Checkout/view/frontend/web/template/onepage.html

https://github.com/magento/magento2/blob/fc66fe443d87c4e69fe9022d7c95fe66e0565978/app/code/Magento/Checkout/view/frontend/layout/checkout_index_index.xml#L39

How to customize Magento 2 Maintenance mode page?

Edit the file pub/errors/default/503.phtml and put the following code

<?php
/**
 * How to edit and customize code of Magento 2 Maintenance 503 Page
 * Add analytics if any
 * Replace <COMPANY NAME> with your Organization Name
 */
?>
<!doctype html>
<title>Site Maintenance</title>
<style>
  body { text-align: center; padding: 150px; }
  h1 { font-size: 50px; }
  body { font: 20px Helvetica, sans-serif; color: #333; }
  article { display: block; text-align: left; width: 650px; margin: 0 auto; }
  a { color: #dc8100; text-decoration: none; }
  a:hover { color: #333; text-decoration: none; }
</style>

<article>
    <h1>We&rsquo;ll be back soon!</h1>
    <div>
        <p>Sorry for the inconvenience but we&rsquo;re performing some maintenance at the moment. If you need to you can always <a href="mailto:[email protected] NAME">contact us</a>, otherwise we&rsquo;ll be back online shortly!</p>
        <p>&mdash; Team COMPANY NAME</p>
    </div>
</article>