Line Chart Sample Missing

[jwalkerinterpres]

Describe/explain the bug

The page https://nivo.rocks/line/ links (with the text "Sample") to https://nivo-api.herokuapp.com/nivo/samples/line.svg. That link is broken.

To Reproduce

Steps to reproduce the behavior:

1. Visit https://nivo.rocks/line/ links
2. Click on the "Sample" link
3. See a broken link page

Expected behavior
You see a sample line chart.

Screenshots

Desktop (please complete the following information):
Smartphone (please complete the following information):
Irrelevant (this is a web-based issue applicable to all platforms

Additional context
Add any other context about the problem here.