Review Github Flavoured Markdown & determine where it will break our readmes

As @newswim kindly pointed out in https://github.com/dwyl/technology-stack/issues/54, Github is now rolling out [Github Flavoured Markdown](https://github.github.com/gfm/) (or GFM).

Our learning community relies heavily on readme's and as has been pointed out before, the formatting of these readme's lends us our [quirky conversational style](https://github.com/dwyl/start-here/issues/118#issuecomment-279115518).

**Task:** Review the GFM spec for the most commonly used markdown in dwyl and determine what is likely to break (we can then look to write a script to fix this across the board separately).