Font Awesome and analyticsTracking

[EricClaeys]

• Upgrade to newer Font Awesome and make it local to avoid a call to the Internet.
• Conditionally include analyticsTracking.js - I suspect few people use it so in most cases there's no reason to include it.
• Replace index.html with index.php which allows conditionally including analyticsTracking.js, but more importantly, allows new features to be introduced via separate PRs.