Footer: Broken links: Telegram, discord, Github, twitter

[ImdioR]

Hi there.

Just found that in case if you will be redirected into documentation and the link doesn`t exist anymore the footer links are broken:

How to reproduce:

1. https://docs.centrifuge.io/use/participate-in-network/ (old doc - deleted)
2. Or try to access any not existing page - https://docs.centrifuge.io/l1

[annamehr]

@ImdioR what should be the redirect from the old link?

[ImdioR]

@annamehr The documentation part was re-elaborated and changed.
However, Orhan suggested this: https://docs.centrifuge.io/use/governance-process/