Update documentation for 0.8.4 release

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Summary by cubic

Updated docs for 0.8.4: homepage banner now links to the 0.8.4 release notes and the changelog is added.
The 0.7 → 0.8 guide now covers the admin permission group rework: manage_settings enforced on extension settings, legacy staff auto-assigned to “Migrated staff” with selective backfill, guidance to replace $staff->hasPermission(...)/role/permissions checks with has_permission and staff-service group methods, and a reminder to review group assignments after upgrade.

^{Written for commit 3bc3043. Summary will update on new commits.}

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	docs	3bc3043	Commit Preview URL Branch Preview URL	Jul 11 2026, 05:03 PM

[cubic-dev-ai]

All reported issues were addressed across 3 files

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[cubic-dev-ai]

All reported issues were addressed across 2 files (changes from recent commits).

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[cubic-dev-ai]

0 issues found across 1 file (changes from recent commits).

<sub>Auto-approved: Documentation updates: homepage banner link version bump, 0.7→0.8 upgrade guide additions for admin permissions rework, and changelog for the 0.8.4 release. No logic, config, or code changes.

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