Current issues where we can improve

• Taking the step from example to standalone crate (templates)
• Simpler more understandable examples for basic things like blinky
• Better example documentation both in code and readme (now included inline in book as of Improve docs navigation #237)

@ctron Iirc, you had some more points around actor documentation. Could you add those points here? There are some actor introcution in the 'Introduction', and a programmatic introduction in the 'Basic application' section of https://book.drogue.io/drogue-device/dev/index.html. But iirc you had some other valid points.