Update JS front matter name, use cross-env where available, adds build-nocolor script

content/blog/fifthpost.md

@@ -1,4 +1,4 @@
----node
+---js
 const title = "This is a fifth post (draft)";
 const date = "2023-01-23";
 const draft = true;

content/tag-pages.njk

@@ -1,4 +1,4 @@
----node
+---js
 // <script>
 const pagination = {
 	data: "collections",