Generate UI: Clearer Table Boundaries

[chrisknoll]

Expected behavior

Should be easier to see a row of a source line up with a button for generate.

Actual behavior

From the above screenshot, you can see it's hard to line up a row on the left with the button on the right.

Potential sollutions

1. Hover Style: if the row that you were hovering was highlighted, you could see that a generate button is associated with a source more clearly.
2. Re-arrange columns: move Generate button to first column so the button is right next to the source
3. Table Style: add borders to table to see the alignment better.

[nhall6]

@fdefalco I can't assign you, but tagging you here on the issue.