Fix: github-pages demo

[k8188219]

fix chrome console error msg

Refused to execute script from 'https://tbfleming.github.io/em-shell/bin/busybox' because its MIME type ('application/octet-stream') is not executable.

[Clockiscool1234]

it works

[westurner]

Can confirm that it works:

git clone https://github.com/tbfleming/em-shell ./em-shell
cd "$_"
git fetch origin pull/7/head:pr7
git checkout pr7

python -m http.server &
python -m webbrowser http://localhost:8000