reference-file.csv file missing in the reporsitory

[mnhn-paul]

unfortunatly the link to the "reference-file.csv" in the toutorial section is not leading to anything.

https://github.com/DiSSCo/SDR/blob/main/docs/tutorials/reference-file.csv

The 'DiSSCo/SDR' repository doesn't contain the 'docs/tutorials/reference-file.csv' path in 'main'.