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

public/demo/hashTwt-example-result.js

@@ -1,3 +1,5 @@
+// @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt
+
 import { hashTwt } from "/dist-browser/twtxt-lib.js";
 
 let wasHashTwtResultAppended = false;
@@ -61,3 +63,5 @@ formHash.addEventListener("submit", (e) => {
 	document.body.classList.add("isLoaded");
 	wasHashTwtResultAppended = true;
 });
+
+// @license-end