create cmd template should have external config and script

[fpliger]

Currently, the create cmd generates index.html and manifest.json (soon to be pyscript.toml #46 ). But

1. the config is not loaded into <py-config> at all
2. the python script should be in an external file and not inline (in order for us to encourage best practices and more flexibility)

[FabioRosado]

I am closing this issue as it's out dated. The new template is not using main.py and pyscript.toml but the code in index.html is very old and needs updating.