resolve issue with missing vite-plugin-node-polyfills

add LibreJS licenses to all demo JS
split browser build from node build
add copyright info to license files
update to use yarn v4.13.0
update to v0.9.2

dist-demo/demo/browser-detection.js

@@ -0,0 +1,7 @@
+// @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt
+
+const isGecko = !!navigator.userAgent.match(/gecko/i);
+
+if (isGecko) document.body.classList.add("isGecko");
+
+// @license-end