themes-wordpress/disco/templates/header-footer-only.html

<!-- wp:template-part {"slug":"header","tagName":"header"} /-->

<!-- wp:group {"tagName":"main","lock":{"move":false,"remove":true}} -->
<main class="wp-block-group">

<!-- wp:post-content {"layout":{"inherit":true},"lock":{"move":false,"remove":true}} /-->
</main>
<!-- /wp:group -->

<!-- wp:template-part {"slug":"footer","tagName":"footer"} /-->