housekeeping: bundle size reductions (#4713)

* set new bundlesize goal
* preserve `GeneratorFunction` instead of all function names
* use js-yaml fork that doesn't require esprima
* set HTML content directly, instead of using React-Markdown
* use remarkable for all Markdown rendering
* add babel-plugin-transform-react-remove-prop-types
* remove SplitPaneMode plugin
* remove react-collapse
* remove AST plugin, and yaml-js
* trim Markdown HTML string output before rendering
* disable obsolete function name preservation
* add `getComponent` to propTypes

make-webpack-config.js

@@ -72,9 +72,10 @@ module.exports = function(rules, options) {
       new UglifyJsPlugin({
         uglifyOptions: {
           mangle: specialOptions.mangle,
+          compress: specialOptions.mangle,
           beautify: !specialOptions.mangle,
-          keep_fnames: true
         },
+        
         sourceMap: true,
       }),
       new webpack.LoaderOptionsPlugin({
@@ -142,7 +143,9 @@ module.exports = function(rules, options) {
         "node_modules"
       ],
       extensions: [".web.js", ".js", ".jsx", ".json", ".less"],
-      alias: {}
+      alias: {
+        "js-yaml": "@kyleshockey/js-yaml"
+      }
     },
 
   devtool: specialOptions.sourcemaps ? "nosource-source-map" : false,