docs: update quick-start.md

[Davenury]

Change app-quit link definition, so both window-all-closed and app-quit redirects to appropriate sites.

Description of Change

Checklist

• PR description included and stakeholders cc'd

Release Notes

Notes: none

[welcome]

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• fix: don't overwrite prevent_default if default wasn't prevented
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[release-clerk]

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[trop]

I have automatically backported this PR to "12-x-y", please check out #30132

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I have automatically backported this PR to "13-x-y", please check out #30133

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I have automatically backported this PR to "14-x-y", please check out #30134