docs: Update references to support channel in Discord.

[himerus]

Changes

Updated doc references from #support-threads to #support.

Testing

Visually.

Docs

Updated doc references from #support-threads to #support.

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Latest commit: 34fbd9e

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[himerus]

I did also notice the following in packages/intgrations don't contain the ##Troubleshooting and ##Contributing sections:

• cloudflare
• lit
• react
• solid
• svelte
• turbolinks
• vue

I could easily add in those sections on this PR if desired.

[bluwy]

I did also notice the following in packages/intgrations don't contain the ##Troubleshooting and ##Contributing sections:

I think that would be good too. /cc @withastro/maintainers-docs