Archeo: Tidy up responsive font sizes (#5522)

* Tidy up font scaling.

* Revise max sizes.

archeo/theme.json

@@ -80,17 +80,17 @@
 				},
 				{
 					"name": "Medium",
-					"size": "min(max(24px, 5vw), 32px)",
+					"size": "clamp(24px, 5vw, 32px)",
 					"slug": "medium"
 				},
 				{
 					"name": "Large",
-					"size": "min(max(36px, 5vw), 48px)",
+					"size": "clamp(36px, 6vw, 48px)",
 					"slug": "large"
 				},
 				{
 					"name": "Huge",
-					"size": "min(max(48px, 5vw), 72px)",
+					"size": "clamp(42px, 7vw, 64px)",
 					"slug": "huge"
 				}
 			]
@@ -132,7 +132,7 @@
 		"elements": {
 			"h1": {
 				"typography": {
-					"fontSize": "min(max(64px, 5vw), 100px)"
+					"fontSize": "clamp(48px, 8vw, 72px)"
 				}
 			},
 			"h2": {