Grant playground stopped working
Hi,
I just noticed that the playground hosted at **https://grant.outofindex.com/** has stopped working. When I open the page, It shows nothing but the title. I am not sure if it's relevant to this repository. I am raising the issue here since I couldn't find the source code for the playground.

![image](https://user-images.githubusercontent.com/16909852/106232095-2dfa1280-6219-11eb-9fae-5229700c9251.png)
