Tinlake - replace the link to Slack with Discord in the help section

[Tjure07]

Hello team,

on the centrifuge.tinlake.io homepage in the help section, the link to Slack can still be found.

Because of the migration from Slack to Discord please replace the link in the help section too.

Thanks.
Christian

[xmxanuel]

Thanks for info. It is already fixed in another Repo