YouTube widget is missing from the homepage

[castrojo]

Issue description YouTube widget is missing from the homepage

Steps to reproduce the issue

1. Go to grpc.io
2. Scroll down to the bottom
3. Social widgets exist for twitter, the group, and gitter, but not YouTube.

Expected behavior I wanted to check the youtube channel out but it's missing from the front page, but I knew the channel existed and clicked around until I found it on the community page.

Filing this because when most people see that style of social icon on the front page they assume that's what the project has.

Screenshots

[easwars]

@temawi : Would you know who would be responsible for this?

[temawi]

@YifeiZhuang Could you please include a link to the gRPC YouTube channel here?