Update slack archive link

[vladimir-mck]

Description

Resolves #156

Development notes

I've update the slack archive link on the FAQ page.

QA notes

It can be tested in the FAQ section of the preview.

Checklist

• [ ] Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• [ ] Added tests to cover my changes, where applicable

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[stichbury]

Thanks @vladimir-mck that is all good for me.