Start bringing over a (curated) configuration for CSS and Eleventy

src/_includes/base.njk

@@ -0,0 +1,11 @@
+<!doctype html>
+<html lang={{data.page.lang}}>
+	<head>
+		<title>{{ title }} | {{ metadata.site.name }}</title>
+
+		<link rel="stylesheet" type="text/css" href="/assets/css/styles.css" />
+	</head>
+	<body>
+		{{ content | safe }}
+	</body>
+</html>