chore: remove posthog

[vladjerca]

The Self-Hosted Dream: A Temporary Retreat

This pull request marks a temporary cessation in our pursuit of self-hosting. The siren song of independent deployment proved too treacherous, the rocky shores of CORS errors proving too difficult to navigate. We've wrestled with the beast, but for now, we must concede defeat. The self-hosted dream, like a fleeting phantom, recedes into the mist.

(This decision, like a detective abandoning a dead-end lead, is a pragmatic one. We've invested time and effort in the self-hosting route, but the CORS labyrinth has proven too complex for our current resources. We'll regroup, reassess, and seek new avenues for achieving our goals. The self-hosted dream may be deferred, but it is not forgotten. Like a cold case, it will remain in the back of our minds, waiting for the right moment to be reopened.)

[deepsource-io]

Here's the code health analysis summary for commits 7cbc47b..ef763b9. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
JavaScript	✅ Success		View Check ↗
Test coverage	✅ Success		View Check ↗

Code Coverage Report

Metric	Aggregate	Javascript
Branch Coverage	26.7%	26.7%
Composite Coverage	61.3%	61.3%
Line Coverage	73.2% (up 0.1% from main)	73.2% (up 0.1% from main)

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