Feature request: Add `Actions` menu to each DANDI dataset page

[kabilar]

When I browse datasets on https://lite.brainlife.io/dandi and then select a given dataset, I am taken to the dataset overview page:

On this dataset overview page, I cannot take an action on that dataset since the Action menu is only available on the top-level page: https://lite.brainlife.io/dandi.

Thank you.

cc @satra @ayendiki @tjgrafft @francopestilli

[tjgrafft]

@kabilar I've added the Action button to the dataset detail page. The placeholders for Visualize and Download are still in place, but will be addressed in their respective feature work.

[kabilar]

Thank you