Zui Monorepo

[jameskerr]

This PR moves all of the packages in zealot into the zui repo.

The structure of this repo is now as follows:

apps
└── zui
packages
├── e2e-tests
├── sample-data
├── zed-js
├── zed-node
├── zed-wasm
└── zui-test-data

It's managed by nx.

The yarn commands to start, test, and build are all still the same.

This will make our development cycle much faster, while enabling us to release separate packages to npm.

Things to test and fix:

• Packaging a dev build
• Releasing the app
• Zui Insiders Workflow