Improve documentation site to make it easier to find communication on Slack/Discord #8138
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Which issue does this PR close?
Part of #7013
Rationale for this change
I think it is not clear from the documentation site how to find Slack/Discord as it is buried under a link to the community page.
Also, while trying to update that text, I tried to explain better the differences between Discord and ASF Slack as well as remove the outdated "weekly syncs" that haven't happened in 6 months.
What changes are included in this PR?
Are these changes tested?
N/A
Are there any user-facing changes?
Doc updates