Address warnings about the package.json file

Which probably does not fix #1910, but it helps anyway.

Author: JJ

highlights/package.json

@@ -8,12 +8,12 @@
   },
   "author": "Samantha McVey",
   "license": "Artistic-2.0",
-  "homepage": "docs.perl6.org",
+  "homepage": "https://docs.perl6.org",
   "repository": "https://github.com/perl6/doc.git",
   "dependencies": {
     "highlights": "<2.0",
     "less": "latest",
-    "coffee-script": "latest",
+    "coffeescript": "latest",
     "node-sass": "latest"
   }
 }