Fix the GitHub page for this project

[MrPowers]

The GitHub page isn't working at the moment.

It's giving a 404 "There isn't a GitHub Pages site here" error.

The console says "Failed to load resource: the server responded with a status of 404 ()".

I say we update all the plugin versions to match spark-alchemy, regenerate the GitHub pages, and see if that fixes the problem. Sounds good?

[ssimeonov]

That is very odd: the gh-pages branch hasn't been updated in years.