feat: Change file structure

- Move return object to named export for 11ty config
- screens is now view
- 11ty data files moved to view/_data
- templates is now view/_includes
- Both are the default directories
- data is now used as intended, for user data
- Update index to reflect filenames and structure

source/view/_data/start.json

@@ -0,0 +1,14 @@
+[
+	{
+		"text": "Index",
+		"href": "/"
+	},
+	{
+		"text": "Basics",
+		"href": "/demo/basics.html"
+	},
+	{
+		"text": "Portal",
+		"href": "/demo/examples/portal.html"
+	}
+]