Cleanup webpack example configs (#606)

* Remove Buffer/process plugins

* Adjust

* Cleanup README

packages/react-identicon/src/Demo.tsx

@@ -1,54 +0,0 @@
-// Copyright 2017-2022 @polkadot/react-identicon authors & contributors
-// SPDX-License-Identifier: Apache-2.0
-
-import React from 'react';
-import ReactDOM from 'react-dom';
-
-import { encodeAddress, randomAsU8a } from '@polkadot/util-crypto';
-
-import { Identicon } from '.';
-
-const THEMES = ['beachball', 'polkadot', 'substrate'];
-
-export default class Demo extends React.PureComponent {
-  public override render (): React.ReactNode {
-    const identities: string[] = [];
-
-    while (identities.length !== 50) {
-      identities.push(
-        encodeAddress(randomAsU8a(32))
-      );
-    }
-
-    return (
-      <div>
-        <div>
-          {identities.map((value, index): React.ReactNode => (
-            <Identicon
-              key={value.toString()}
-              theme={THEMES[index % THEMES.length] as 'empty'}
-              value={value}
-            />
-          ))}
-        </div>
-        <div>
-          {THEMES.map((theme): React.ReactNode => (
-            <Identicon
-              key={theme}
-              theme={theme as 'empty'}
-              value='5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY'
-            />
-          ))}
-        </div>
-      </div>
-    );
-  }
-}
-
-const rootElement = document.getElementById('demo');
-
-if (!rootElement) {
-  throw new Error('Unable to find element with id \'demo\'');
-}
-
-ReactDOM.render(<Demo />, rootElement);

packages/react-identicon/webpack.config.js

@@ -1,45 +0,0 @@
-// Copyright 2017-2022 @polkadot/react-identicon authors & contributors
-// SPDX-License-Identifier: Apache-2.0
-
-const path = require('path');
-const webpack = require('webpack');
-const ENV = process.env.NODE_ENV || 'development';
-const isProd = ENV === 'production';
-
-module.exports = {
-  context: __dirname,
-  devtool: isProd ? 'source-map' : 'eval-cheap-source-map',
-  entry: './src/Demo.tsx',
-  mode: ENV,
-  module: {
-    rules: [
-      {
-        exclude: /(node_modules)/,
-        test: /\.(js|ts|tsx)$/,
-        use: [
-          'babel-loader'
-        ]
-      }
-    ]
-  },
-  output: {
-    filename: './Demo.js',
-    path: path.join(__dirname, 'build')
-  },
-  plugins: [
-    new webpack.ProvidePlugin({
-      Buffer: ['buffer', 'Buffer']
-    }),
-    new webpack.ProvidePlugin({
-      process: 'process/browser'
-    })
-  ],
-  resolve: {
-    alias: {
-      '@polkadot/ui-settings': path.resolve(__dirname, '../ui-settings/build'),
-      '@polkadot/ui-shared': path.resolve(__dirname, '../ui-shared/build'),
-      'process/browser': require.resolve('process/browser')
-    },
-    extensions: ['.js', '.jsx', '.ts', '.tsx']
-  }
-};