Add Emoji's to the chapter headers

[splatyourbugs]

To make our repo's stand out a bit more, let's give them a spice of life with some emoji's in the chapter text.

Here's an example from our production website ReadMe

### :blue_book: Documentation
Our private repository and documentation is available at GitHub. Visit https://docs.bugsplat.com/ for further info.

You can find all of the emoji's github allows here - https://gist.github.com/rxaviers/7360908