docs(guides): rewrite tree-shaking and production (#1508)

This continues our work #1258 and resolves the issues mentioned
in #1331. The updates to tree-shaking were more just clean up and
synchronization while production included more significant changes
and a strong recommendation of `webpack-merge`. The old guide
pointed out that _you could_ just maintain two separate configs and
duplicate the overlap but I don't think we should recommend this.

Resolves #1331

Author: skipjack

src/content/guides/development.md

@@ -267,8 +267,7 @@ __webpack.config.js__
       new CleanWebpackPlugin(['dist']),
       new HtmlWebpackPlugin({
         title: 'Output Management'
-      }),
-      new webpack.HotModuleReplacementPlugin()
+      })
     ],
     output: {
       filename: '[name].bundle.js',