(Slow) dataframe and metadata download

[t-kramer]

The current download time is very long due to exporting the entire dataframe with every column. To speed up the download, consider reducing the columns or offering basic and detailed versions to the user.

I’m using a .zip file, but logs indicate a 15-20s download time for the deployed version, which is too long. We should try to speed it up. I'll look into this.

[t-kramer]

Discussing this issue, we agreed to offer users the possibility to download a "Basic" or "Detailed" version of the dataframe. Default should be basic.

[t-kramer]

This issue also covers the download of metadata/calculation settings. Users might be interested in this and we should offer a solution for this. We already have the metadata JSON files, we probably only need a script converting the information into a more readable and user-friendly format.