Documentation and example layout

[drewnoakes]

A few small things.

• NuGet badges for the current versions in the README
• Consistent layout of example code, one level deep (looks nicer on GH landing page)
• Bump copyright year
• Use simpler FontAwesome URL (old URL redirects to this)
• Some documentation tweaks/formatting

Feel free to pick and choose all, some or no commits :)

Thanks for getting 4.7 out with recent fixes. That's really great. Nothing in this PR needs another release.