Update demo copyright headers.

demo/configs/webpack/common.js

+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// All rights reserved.
+
+// This source code is licensed under the license found in the
+// LICENSE file in the root directory of this source tree.
+
 const { resolve } = require("path");
 const HtmlWebpackPlugin = require("html-webpack-plugin");
 const FriendlyErrorsWebpackPlugin = require("friendly-errors-webpack-plugin");

demo/configs/webpack/dev.js

+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// All rights reserved.
+
+// This source code is licensed under the license found in the
+// LICENSE file in the root directory of this source tree.
+
 // development config
 const { merge } = require("webpack-merge");
 const commonConfig = require("./common");

demo/configs/webpack/prod.js

+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// All rights reserved.
+
+// This source code is licensed under the license found in the
+// LICENSE file in the root directory of this source tree.
+
 // production config
 const { merge } = require("webpack-merge");
 const { resolve } = require("path");

demo/postcss.config.js

+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// All rights reserved.
+
+// This source code is licensed under the license found in the
+// LICENSE file in the root directory of this source tree.
+
 const tailwindcss = require("tailwindcss");
 module.exports = {
   plugins: ["postcss-preset-env", 'tailwindcss/nesting', tailwindcss],

demo/tailwind.config.js

+// Copyright (c) Meta Platforms, Inc. and affiliates.
+// All rights reserved.
+
+// This source code is licensed under the license found in the
+// LICENSE file in the root directory of this source tree.
+
 /** @type {import('tailwindcss').Config} */
 module.exports = {
   content: ["./src/**/*.{html,js,tsx}"],