perf: install core libs directly rather than via external CDN

Increase performance in countries such as China.

Addresses the case where countries block or restrict CDNs, or when external CDNs go offline.

See https://github.com/wowchemy/wowchemy-hugo-modules/pull/2351

scripts/copy_libraries.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Install node_modules manually so that users don't need to use Yarn.
+
+cd ..
+
+cp node_modules/jquery/dist/jquery.min.js wowchemy/assets/js/_vendor/
+cp node_modules/instant.page/instantpage.js wowchemy/assets/js/_vendor/
+cp -r 'node_modules/@fortawesome/fontawesome-free/webfonts' wowchemy/static/
+cp -r 'node_modules/@fortawesome/fontawesome-free/css/all.min.css' wowchemy/assets/css/libs/fontawesome