Improve organisation of resources
Introduce description front-matter to samples
Add mdn sample link html template and css
Split apart samples and update content
Introduce resources for samples
Introduce resources for links in samples
Update content of functions sample

Added resources and descriptions
Add twitter handle for matthewdunsdon to site
Merge pull request #5 from matthewdunsdon/enhancement/update-samples

Update samples and their resources
Add assert JS/css functionality for use by codepen

Allows codepens to contain asserts with a pass or fail badge.
Add assert checker for NaN
Introduce iffe pattern for codepen code
Simplify argument checking for asserts