Display default config first in the viewer
Would be nice to have an option to choose which data to show first because sometimes dataset starts with ugly data lol. 
example: [bigcode/the-stack-v2](https://huggingface.co/datasets/bigcode/the-stack-v2). (yes, there is only one config with all the data for now but in theory it should be each folder inside `data/` is a config and the first folder should not appear as first in the viewer) 

The most straightforward thing to do is to display config marked as `default` first. I don't know if that require changes here on on the Hub's side?
cc @anton-l  
Display default config first in the viewer: Would be nice to have an option to choose which data to show first because sometimes dataset starts with ugly data lol. 
example: [bigcode/the-stack-v2](https://huggingface.co/datasets/bigcode/the-stack-v2). (yes, there is only one config with all the data for now but in theory it should be each folder inside `data/` is a config and the first folder should not appear as first in the viewer) 

The most straightforward thing to do is to display config marked as `default` first. I don't know if that require changes here on on the Hub's side?
cc @anton-l  