Fix navigation block reference.

rainfall/parts/header.html

@@ -4,7 +4,7 @@
 	<div class="wp-block-group alignfull" style="padding-top:30px;padding-bottom:30px">
 		<!-- wp:site-title {"style":{"elements":{"link":{"color":{"text":"var:preset|color|black"}}},"typography":{"textTransform":"uppercase"}},"fontSize":"small"} /-->
 	
-	<!-- wp:navigation {"ref":13,"layout":{"type":"flex","setCascadingProperties":true,"justifyContent":"right","orientation":"horizontal"},"style":{"spacing":{"margin":{"top":"0"},"blockGap":"2.87rem"}}} /-->
+	<!-- wp:navigation {"layout":{"type":"flex","setCascadingProperties":true,"justifyContent":"right","orientation":"horizontal"},"style":{"spacing":{"margin":{"top":"0"},"blockGap":"2.87rem"}}} /-->
 	</div>
 	<!-- /wp:group -->
 </div>