fix: Add jupyterlite-pyodide-kernel dependency

[matthewfeickert]

Resolves #87

* Add jupyterlite-pyodide-kernel to install for pyodide build.
   - jupyterlite-pyodide-kernel had been removed from dependencies of jupyterlite.
* Add jupyterlite pixi environment.
   - Add jupyterlite environment with dependencies and tasks that allow for building
     and serving of the jupyterlite pages locally.