Increase font size in tables for legibility

*NB:* Needs review from designers (hello @antimega)

- Introduces NTA Tabular Numbers as the primary font-face for th/td
- Increases font size to core-16
- Mobile view is core-14 with NTA Tabular Numbers
  - Stab at making this more legible, though we may have some content overflow edge cases
  - mobile `small` still gets hard coded 12px