feature(#160): Use --incremental with _dev_.

Author: arkhi

package.json

@@ -4,7 +4,7 @@
   "version": "0.1.0",
   "description": "CSS Naked Day: website",
   "scripts": {
-    "dev": "eleventy --serve",
+    "dev": "eleventy --serve --incremental",
     "build": "eleventy"
   },
   "repository": {