feat(flags): Document self-serve feature flags integrations

[cmanallen]

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[codecov]

Bundle Report

Changes will increase total bundle size by 717 bytes (0.0%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.37MB	723 bytes (0.01%) ⬆️
sentry-docs-client-array-push	9.28MB	6 bytes (-0.0%) ⬇️

[coolguyzone]

Thanks for the updates, LGTM!

[aliu39]

Looks good, another docs consolidation W 🔥

Let's make the same nested structure for JS integrations, in a follow-up?