Mayland: migrate to use font-family mixin

mayland/sass/_config-child-theme-deep.scss

@@ -20,10 +20,19 @@ $config-global: (
 	"font": (
 		/* Font Family */
 		"family": (
-			"primary": "Poppins\, sans-serif",
-			"secondary": "Poppins\, serif",
+			"primary": (
+				"fallback": "Poppins\, sans-serif",
+				"css-var": '--font-headings',
+			),
+			"secondary": (
+				"fallback": "Poppins\, serif",
+				"css-var": '--font-base',
+			),
 			"code": "monospace, monospace",
-			"ui": "-apple-system\, BlinkMacSystemFont\, \"Segoe UI\"\, \"Roboto\"\, \"Oxygen\"\, \"Ubuntu\"\, \"Cantarell\"\, \"Fira Sans\"\, \"Droid Sans\"\, \"Helvetica Neue\"\, sans-serif",
+			"ui": (
+				"fallback": "-apple-system\, BlinkMacSystemFont\, \"Segoe UI\"\, \"Roboto\"\, \"Oxygen\"\, \"Ubuntu\"\, \"Cantarell\"\, \"Fira Sans\"\, \"Droid Sans\"\, \"Helvetica Neue\"\, sans-serif",
+				"css-var": '--font-base',
+			),
 		),
 		/* Font Size */
 		"size": (
@@ -140,7 +149,10 @@ $config-elements: (
 
 		// Fonts
 		"font": (
-			"family": map-deep-get($config-global, "font", "family", "primary"),
+			"family": (
+				"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+				"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+			),
 			"line-height": map-deep-get($config-global, "font", "line-height", "md"),
 			"size": map-deep-get($config-global, "font", "size", "base"),
 			"weight": bold,
@@ -169,7 +181,10 @@ $config-button: (
 	),
 	// Fonts
 	"font": (
-		"family": map-deep-get($config-global, "font", "family", "ui"),
+		"family": (
+			"fallback": map-deep-get($config-global, "font", "family", "ui", "fallback"),
+			"css-var": map-deep-get($config-global, "font", "family", "ui", "css-var"),
+		),
 		"size": map-deep-get($config-global, "font", "size", "sm"),
 		"weight": 600,
 		"line-height": 1,
@@ -201,7 +216,10 @@ $config-heading: (
 	// Fonts & Typography
 	"font": (
 		// Family
-		"family": map-deep-get($config-global, "font", "family", "primary"),
+		"family": (
+			"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+			"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+		),
 		// Size
 		"size": (
 			"h6": map-deep-get($config-global, "font", "size", "sm"),
@@ -240,7 +258,10 @@ $config-heading: (
 $config-list: (
 	// Fonts
 	"font": (
-		"family": #{map-deep-get($config-global, "font", "family", "primary")},
+		"family": (
+			"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+			"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+		),
 	),
 );
 
@@ -250,7 +271,10 @@ $config-list: (
 $config-pullquote: (
 	// Font
 	"font": (
-		"family": #{map-deep-get($config-global, "font", "family", "primary")},
+		"family": (
+			"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+			"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+		),
 	),
 	// Border
 	"color": (
@@ -269,7 +293,10 @@ $config-pullquote: (
 $config-quote: (
 	// Font
 	"font": (
-		"family": #{map-deep-get($config-global, "font", "family", "primary")},
+		"family": (
+			"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+			"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+		),
 	),
 );
 
@@ -296,7 +323,10 @@ $config-header: (
 		"title": (
 			// Fonts
 			"font": (
-				"family": map-deep-get($config-global, "font", "family", "primary"),
+				"family": (
+					"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+					"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+				),
 				"size": map-deep-get($config-global, "font", "size", "lg"),
 				"weight": 600,
 				"line-height": 1,
@@ -306,7 +336,10 @@ $config-header: (
 		"description": (
 			// Fonts
 			"font": (
-				"family": map-deep-get($config-global, "font", "family", "primary"),
+				"family": (
+					"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+					"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+				),
 				"size": map-deep-get($config-global, "font", "size", "sm"),
 			),
 		),
@@ -321,7 +354,10 @@ $config-header: (
 		),
 		// Fonts
 		"font": (
-			"family": map-deep-get($config-global, "font", "family", "primary"),
+			"family": (
+				"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+				"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+			),
 			"family-css-variable": '--font-headings',
 			"size": map-deep-get($config-global, "font", "size", "sm"),
 			"weight": 400,
@@ -352,7 +388,10 @@ $config-footer: (
 	),
 	// Fonts
 	"font": (
-		"family": map-deep-get($config-global, "font", "family", "primary"),
+		"family": (
+			"fallback": map-deep-get($config-global, "font", "family", "primary", "fallback"),
+			"css-var": map-deep-get($config-global, "font", "family", "primary", "css-var"),
+		),
 		"size": map-deep-get($config-global, "font", "size", "sm"),
 		"line-height": map-deep-get($config-global, "font", "line-height", "sm"),
 	),

mayland/style-editor.css

@@ -115,6 +115,10 @@ $grid-configuration: map-extend($grid-configuration-default, $grid-configuration
  * Crop Text Boundry
  * - Sets a fixed-width on content within alignwide and alignfull blocks
  */
+/**
+ * Add font-family using CSS variables.
+ * It also adds the proper fallback for browsers without support.
+ */
 /**
  * Child Theme Name
  */

mayland/style-rtl.css

@@ -136,6 +136,10 @@ $grid-configuration: map-extend($grid-configuration-default, $grid-configuration
  * Crop Text Boundry
  * - Sets a fixed-width on content within alignwide and alignfull blocks
  */
+/**
+ * Add font-family using CSS variables.
+ * It also adds the proper fallback for browsers without support.
+ */
 /**
  * Child Theme Deep
  */
@@ -1636,7 +1640,7 @@ img {
 ul,
 ol {
 	font-family: Poppins, sans-serif;
-	font-family: var(--font-base, Poppins, sans-serif);
+	font-family: var(--font-headings, Poppins, sans-serif);
 	margin: 0;
 	padding-right: 32px;
 }
@@ -2371,7 +2375,7 @@ table th,
 .site-description {
 	color: currentColor;
 	font-family: Poppins, sans-serif;
-	font-family: var(--font-base, Poppins, sans-serif);
+	font-family: var(--font-headings, Poppins, sans-serif);
 }
 
 body:not(.fse-enabled) .site-title {

mayland/style.css

@@ -136,6 +136,10 @@ $grid-configuration: map-extend($grid-configuration-default, $grid-configuration
  * Crop Text Boundry
  * - Sets a fixed-width on content within alignwide and alignfull blocks
  */
+/**
+ * Add font-family using CSS variables.
+ * It also adds the proper fallback for browsers without support.
+ */
 /**
  * Child Theme Deep
  */
@@ -1636,7 +1640,7 @@ img {
 ul,
 ol {
 	font-family: Poppins, sans-serif;
-	font-family: var(--font-base, Poppins, sans-serif);
+	font-family: var(--font-headings, Poppins, sans-serif);
 	margin: 0;
 	padding-left: 32px;
 }
@@ -2388,7 +2392,7 @@ table th,
 .site-description {
 	color: currentColor;
 	font-family: Poppins, sans-serif;
-	font-family: var(--font-base, Poppins, sans-serif);
+	font-family: var(--font-headings, Poppins, sans-serif);
 }
 
 body:not(.fse-enabled) .site-title {