@melech Normally I would set the Base directory in the Netlify UI, as per the documentation I originally linked:
https://docs.netlify.com/configure-builds/overview/#build-settings
The documentation for using File-based Configuration is here:
https://docs.netlify.com/configure-builds/file-based-configuration/
If you want to set Base directory with the netlify.toml you would need to ensure that file is in the root of the repository, as they mention here:
https://docs.netlify.com/configure-builds/file-based-configuration/#file-location
You currently have your netlify.toml in the moonrise folder too:
The main thing to understand is that most of the time, under normal “non-framework specific” conditions, Netlify doesn’t look through your repository to try and locate things or auto-determine what to run.
You set where it should navigate to, what it should execute etc.