Add Header & Footer-only template.

blockbase/block-templates/header-footer-only.html

@@ -0,0 +1,10 @@
+<!-- wp:template-part {"slug":"header","tagName":"header","layout":{"inherit":true}} /-->
+
+<!-- wp:group {"tagName":"main"} -->
+<main class="wp-block-group post-content">
+
+<!-- wp:post-content {"layout":{"inherit":true}} /-->
+</main>
+<!-- /wp:group -->
+
+<!-- wp:template-part {"slug":"footer","tagName":"footer","layout":{"inherit":true}} /-->

blockbase/theme.json

@@ -18,6 +18,14 @@
 				"page",
 				"post"
 			]
+		},
+		{
+			"name": "header-footer-only",
+			"title": "Header and Footer Only",
+			"postTypes": [
+				"page",
+				"post"
+			]
 		}
 	],
 	"settings": {