Add incomplete functionality/styling to datasets page

[aswallace]

The following tasks were skipped in the MVP of the dataset page since were considered lower priority and/or needed to be looked into further:

• Clicking on the header of the dataset manifests table should allow users to sort that column in desc/asc order. Header should have a hover state to indicate clickability
  • This requires diving into the FluentUI Shimmered DetailsList component
  • Was not prioritized since we don't have datasets yet
• Responsive rows: Should have a faded overlay on the right on overflow, and hover buttons should stick to the right side of the table
• Currently, after a user loads a dataset into the app, it takes 3 clicks of the browser's back button to get back to the dataset page (i.e., there are multiple route changes instead of just one)