add posthog analytics

[nud3l]

📝 Description

Adds PostHog analytics: https://eu.posthog.com

💣 Is this a breaking change (Yes/No): No

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Latest commit: d96913a

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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