feature(drawer): add empty link analytics graphic

[orbitalsqwib]

Problem

There is no graphic to show when there are no link analytics

Closes [insert issue #]

Solution

How did you solve the problem?

Features:

• Adds graphic assets for empty link analytics
• Updated the link drawer control panel code to show the graphics when there are no link analytics

Before & After Screenshots

BEFORE
Go.gov.sg

For.edu.sg

AFTER:
Go.gov.sg

For.edu.sg

Tests

• Create a new link on both edu and for, then click into the link drawer control panel
• Check that the graphics show up on both edu as above in the screenshots