Fix amp-script headers for wAMPboy demo.

[torch2424]

Amp script started enforcing some new headers restrictions to where the worker script comes from:

ampproject/amphtml#20427

Thus, we may have to find a way to hack around this on github pages, or move wasmboy to my servers 😞

[torch2424]

So I fixed the headers using: https://glitch.com/edit/#!/torch2424-amp-glitch-express

However, now I'm sending 4x too much script 😂 Work so far is in: amp-script-fixes

cc @kristoferbaxter if you have time 😄