#43 React server-side render

[Quicksaver]

Closes #43 - Generates full markup at build time, while retaining any needed JS dynamics on the browser side.

Now using webpack to serve locally

• employ common NODE_ENV var usage, either "production" or "development";
• hugo serves the file structure to a temporary directory;
• those files are then processed by webpack to append the react output;
• there's a better loading (percentage) indicator in the console when building, so it's easier to know when webpack is done (Cleaner console when serving locally #24);
• webpack is also the local server used as well, when you run yarn start; used to be hugo doing that, so one more step towards complete hugo abstraction;
• webpack server doesn't add the trailing slash correctly in the admin path and so Netlify CMS fails to load:
  • http://localhost:1313/admin becomes http://localhost:1313/admin#/
  • temporary solution is to always type the forward slash;
  • doesn't affect live builds on Netlify of course, which redirect to the trailing slash correctly, it's only a local issue.

App entry point

• Renamed the folder jsx to components to be more in-line with common development procedure;
• The entry point for resulting app.min.js file, called in the browser, is now components/App.jsx, which must be modified to list and initialize every individual component per project/site.

New BesugoComponent properties and methods

(They're all better documented in the code.)

• .view(), that returns either the window object or CMS's iframe, depending on where it is being rendered, for easier abstraction during any implementation work;
• .config is an object that defines the component within the website context, see inline comments on what properties it expects;
• .extraProps() called before building a component, to fetch any information necessary not found in props; use to append directly to props;
• .buildContainer() what form should the component's container take; by default this returns a simple div. Useful when you're building lists and want to wrap lis in a ul for instance.