Footer links are incorrect

[jnmclarty]

The links to the social media and slack group are not correct.

• Need to fix Slack link
• Need to fix Twitter link
• Need to fix Youtube link

Unclear what GitHub brand you folks want to use for the site.

[johnsBeharry]

thanks for reporting this! @jnmclarty

[johnsBeharry]

NOTES

links should be configurable in the Jekyll config.yaml file

1. slack link should go to the bitcoin design community ()
2. twitter: https://twitter.com/BUILDwithBOLTS
3. need to create a channel on YouTube and bitcoinTV
4. we've also got a twitch but no plans for this as yet