Jupyter path for Quarto when installed via IJulia

[palday]

As noted by @dmbates in #3, there is a bit of a tricky issue in getting quarto to find Jupyter when installed via IJulia + the hidden miniconda environment. For Linux and Mac users, we can probably create a simple shell command that will work on bash and zsh (the current Mac default shell), but we'll need verify how to do this on Windows. When I get a chance, I'll start a Windows VM and see what's required.