chore: Added CSP headers to next app for testing what we document

[benjackwhite]

Changes

Related documentation updates PostHog/posthog.com#9906

Confirmed that this covers everything needed for the toolbar and the general script loading.

Checklist

• Tests for new code (see advice on the tests we use)
• Accounted for the impact of any changes across different browsers
• Accounted for backwards compatibility of any changes (no breaking changes in posthog-js!)

[vercel]

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Name	Status	Preview	Updated (UTC)
posthog-js	✅ Ready (Inspect)	Visit Preview	Nov 15, 2024 5:45pm

[github-actions]

Size Change: 0 B

Total Size: 3.11 MB

ℹ️ View Unchanged

Filename	Size
dist/all-external-dependencies.js	204 kB
dist/array.full.es5.js	254 kB
dist/array.full.js	356 kB
dist/array.full.no-external.js	355 kB
dist/array.js	171 kB
dist/array.no-external.js	170 kB
dist/dead-clicks-autocapture.js	13 kB
dist/exception-autocapture.js	8.8 kB
dist/external-scripts-loader.js	2.19 kB
dist/main.js	172 kB
dist/module.full.js	356 kB
dist/module.full.no-external.js	355 kB
dist/module.js	171 kB
dist/module.no-external.js	170 kB
dist/recorder-v2.js	113 kB
dist/recorder.js	113 kB
dist/surveys-preview.js	56.7 kB
dist/surveys.js	62.1 kB
dist/tracing-headers.js	1.33 kB
dist/web-vitals.js	10.3 kB

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