Add documentation for undocumented one_off_projects and delete some that

don't need to be retained.

Author: favyen2

one_off_projects/crop_type/README.md

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+This contains code built on top of rslearn for the Minderoo global fishing capacity
+estimation project.
+
+Currently this is limited to training the classification model that is run after the
+object detector to refine the predictions.
+
+All of the Minderoo code should be moved together into a single repository for release
+to Minderoo, so this is not expected to exist here after 2024-11-01.

one_off_projects/minderoo/README.md

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+This is code for building the dataset here:
+https://huggingface.co/datasets/allenai/s2-naip
+
+It includes Sentinel-2, NAIP, Sentinel-1, Landsat, OpenStreetMap, WorldCover.
+
+`us_dataset/` contains the code for building the actual dataset along with
+documentation, while `global_windows/` is when we wanted to test model performance in a
+few locations outside the US (the dataset only covers the US so this was separate from
+the dataset itself).