fix spacing in query-loop and post-title size in single/post templates (

#191)

* fix spacing and title size in homepage query loop

* update post title size in page and single templates

* revert post title heading level in query block

* Apply suggestions from code review

Co-authored-by: Sarah Norris <sarah@sekai.co.uk>

Co-authored-by: Sarah Norris <sarah@sekai.co.uk>

theme.json

@@ -370,8 +370,8 @@
 			"core/post-title": {
 				"spacing": {
 					"margin": {
-						"bottom": "var(--wp--preset--spacing--40)",
-						"top": "var(--wp--preset--spacing--40)"
+						"bottom": "var(--wp--preset--spacing--30)",
+						"top": "var(--wp--preset--spacing--30)"
 					}
 				},
 				"typography": {