Datasets menu link

[ryscher]

The "Datasets" entry on the menu points to two different places on the two different sites:

• [ ] Both menus should point to https://covidinfocommons.datascience.columbia.edu/content/datasets
• [ ] On the target page, add a link to the initial paragraph that points to the other view, like "View in table form" https://covidinfocommons.datascience.columbia.edu/coviddatasets