hass-pyscript-jupyter 1.0.0 release

This release has several new features:

• significant refactoring to make hass_pyscript_jupyter a package released on PyPi and installed via pip
• the pip installed package supports a jupyter.pyscript script entry point that provides install and info options, replacing the prior manual steps
• added hass_proxy configuration option for proxy support, from @fleXible
• added support for VSCode client

Given the significant changes, I'm switching to a more typical x.y.z version numbering, and made this version 1.0.0.

The VSCode support has one known issue: it currently starts two pyscript Jupyter kernels, and the second one is typically shutdown soon after it starts. This seems to be benign - it should be invisible to the user, although the global context names (eg, jupyter_0) will increment by 2 on each new session, rather than 1.