Rename markdown math extension to notebook-markdown-extensions

We will use this to experiment with different types of extensions, not just math

extensions/notebook-markdown-extensions/webpack.notebook.js

@@ -0,0 +1,35 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+const path = require('path');
+
+module.exports = {
+	entry: {
+		extension: './notebook/extension.ts',
+	},
+	module: {
+		rules: [
+			{
+				test: /\.tsx?$/,
+				use: 'ts-loader',
+				exclude: /node_modules/
+			},
+			{
+				test: /\.css$/i,
+				use: ['style-loader', 'css-loader'],
+			},
+			{
+				test: /\.(woff|woff2|eot|ttf|otf)$/i,
+				use: ['url-loader?limit=100000']
+			},
+		],
+	},
+	resolve: {
+		extensions: ['.tsx', '.ts', '.js']
+	},
+	output: {
+		filename: '[name].js',
+		path: path.resolve(__dirname, 'notebook-out')
+	}
+};