Update episode crop data

[SarahAlidoost]

closes #1

• [x] The data description should be updated;
• [x] Both raster/vector will come from the open-source, therefore need to be cropped with bounding box
• [ ] The Bounding box visualization should use a non-filled box. We should also bear in mind that some people may have difficulty reading the color;
  • (I set non-filled box but regarding colors, I couldn't find a better way in this PR)
• [x] We should integrate original E6: reprojection
• [x] There need to be an introduction in raster -> raster reprojection? We can try rasterize a vector (crop fields polygons), keep its crs, then reproject to the S2 image CRS
• [x] The raster/PDOK_vector overlay should be visualized
• [x] Also teach the data exporting in this episode.

[SarahAlidoost]

@fnattino thank you for reviewing. I addressed your comments. Please have a look.