GitLab

Readme says the default is 'history: false', so it may be surprising
for users - it's easy to miss the contradicting setting in index.html

always enable highlight.js to fix markdown-only usage

Added https prefix to slideshare iframe link, without this I got a 'not found' error when opening the demo locally.

-webkit- stuff only works on webkit browsers.  I'm pretty sure that using the standard `transform:` here works in most modern browsers.