feat: Added head filter

src/_config/filters.js

@@ -0,0 +1,10 @@
+export default function(eleventyConfig) {
+	// Get the first element of a collection.
+	eleventyConfig.addFilter("head", (array) => {
+		if(!Array.isArray(array) || array.length === 0) {
+			return null;
+		}
+
+    return array[0];
+	});
+};