Issue with slack link

[jeremi]

When attempting to report an issue, the process recommends using Slack. However, the provided link is not functional unless you have already been added to the Slack account. I suggest that the link should redirect to a service capable of managing invites.

Community Slack
Chat with the community about any issues, questions, or feedback

[jeremi]

I think the link should be changed to https://weaviate.io/slack