update data page to describe all data files

[ErinBecker]

The new setup page (PR) includes a single download link to get all of the data files from FigShare, but this downloaded data is used inconsistently across the lessons. The data page is out of date and doesn't describe all of the data files that learners download and use in this lesson (in the "Files we use in this dataset" section).

• update the "files we use" section of data page to describe all files used
• update the first exercise in organization lesson to use the data file they've already downloaded, rather than downloading in situ.
• add the modified (reshaped and filtered) dataset that is created in the R lesson to Figshare as a backup for learners who weren't able to create it and for instructors who had to skip reshape section
• check whether Python lesson also uses this modified dataset and update if needed

Relevant links:

• data page: https://datacarpentry.org/ecology-workshop/data/
• setup page: https://datacarpentry.org/ecology-workshop/setup/
• PR for new setup page: One setup page #25

[dafnevk]

It seems indeed that the python lesson is using different files than the ones included in the FigShare link.

[tracykteal]

Thanks, yes, we do still need to come back to this. I'm hoping to be able to work on it in May.