Fail slightly more gracefully when JavaScript is disabled

[danmichaelo]

Adding a non-JavaScript fallback version is too much work, but we could fail a bit more gracefully. Currently, the unprocessed Angular template is displayed. We could hide this by using ngCloak or just a display:none css rule on the container div. And then add a <noscript> with some information about why the site doesn't work and perhaps some tips on how to add an exception rule to NoScript, which is a popular plugin for disabling JavaScript.