guidance on adding data to EFS (i.e. /shared) or S3

[itcarroll]

Add documentation for adding data without "uploading" through JupyterLab's (slow) upload tool. That's only useful for small files and non-programmatic access.

[itcarroll]

On the Data Products and Availability page (or somewhere else), do you think it’d be worthwhile to have a one-sentence statement about bringing in their own datasets? I say this only because several folks had outside datasets/models they wanted to use, and some projects (like the atmospheric correction one) would require them to bring in their own data. Maybe something like “If your project would benefit from a data source outside of these three sensors (e.g., in-situ, etc.), you are welcome to bring and use your own data or model”? ~ @skyecaplan