Interactive preview page

Append the preview URL to the current page using a #hash.
Example:

https://interactive.guim.co.uk/preview/#https://example.com/
https://interactive.guim.co.uk/preview/#https://interactive.guim.co.uk/boot.js

To preview an embed add the URL as a hash fragment eg.

...or

https://interactive.guim.co.uk/preview/#https://interactive.guim.co.uk/next-gen/music/interactive/2013/aug/20/matthew-herbert-quiz-hearing/boot.js

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