Reorganize templates and librairies

[jlord]

This doesn't have anything specifically with Electron, but I've reorganized a bunch of files and added some directories. They may also change in the future* as I keep working and see what makes most sense. For now:

• assets css, images, fonts
• challenges, challenges-zhtw the ready-to-serve complete pages for challenges (English and Traditional Chinese)
• layouts layout templates for challenges and supporting pages (the later is in progress)
• lib all the js files except for the main.js process that runs the app
• menus js files that layout the menubar for the app
• pages where the pages that aren't the challenges or the home page go
• partials the header and footer files that are added to the layout templates
• raw-content, raw-content-zhtw the main content of each challenge (English and Traditional Chinese)
• verify all the verify scripts that the challenges use (could move into lib or future render lib directory)

*They will very likely change when I decide how to organize JS libs that are just for the main process and ones that are just for the render process (used by the webpages).

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