Misc file moving and cleanup

- Rename JS/CSS for main.html to be consistent (main.js, main.css)
- Add hx.js module to reduce virtual-dom boilerplate
- Move state.js into renderer/lib.js where it belongs
- Rename torrent-list.js -> home.js for consistency
- Rename create-torrent-page.js -> create-torrent.js for consistency

renderer/views/header.js

@@ -1,10 +1,7 @@
 module.exports = Header
 
-var h = require('virtual-dom/h')
-var hyperx = require('hyperx')
-var hx = hyperx(h)
-
 var {dispatcher} = require('../lib/dispatcher')
+var hx = require('../lib/hx')
 
 function Header (state) {
   return hx`