Blog components

Note that these components aren't necessarily *just* for the blog (they can and may well be used in other places).

* [x] Codepen component
* [ ] CodeSandbox component
* [ ] JSFiddle component
* [ ] Gist component
* [ ] Responsive image components
* [ ] Charting
* [ ] What else could we make use of?
  * Soundcloud?
  * Youtube?
  * etc.