Add wasm playground

[lefticus]

From @RobLoach artifacts being generated by ChaiScript/ChaiScript#662 from ChaiScript CI build

[lefticus]

@leftibot add an hourly CRON job action to github that pulls the latest available wasm artifacts from the ChaiScript project and publishes them in a playground page of the chaiscript.com site (this pate). ChaiScript/ChaiScript#662