chore: use new welcome-channel format

[getchoo]

see https://github.com/PrismLauncher/refraction/pull/303

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[Trial97]

Should we close this as: https://github.com/PrismLauncher/prismlauncher.org/commit/137711830176f81b9b6b3f32aba436a28689b74b it looks already implemented

[getchoo]

yep. thanks for the reminder 😄