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-node/index.js

@@ -1,4 +1,10 @@
 // @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt
+/*
+ * twtxt-lib
+ * https://twtxt-lib.itsericwoodward.com/
+ * Copyright (c) 2026 Eric Woodward
+ * Released under the MIT License
+ */
 import { default as default2 } from "./hashTwt.js";
 import { default as default3 } from "./loadAndParseTwtxt.js";
 import { default as default4 } from "./parseTwtxt.js";