Demo page returns an error

**Describe the bug**
Demo webpage returns HTTP Status Code 502. It's unavailable.

**To Reproduce**
Enter the link : https://demo.getheimdall.io/

**Screenshots**
<img width="1680" alt="screen shot 2018-08-04 at 10 58 51" src="https://user-images.githubusercontent.com/8630806/43674017-6d5f6396-97d5-11e8-81ec-19a5779878f7.png">