🚚(helm) add posthog proxy

To contourn ads blocker, we add a proxy to the
posthog service. This way, we can access the
service from the same domain as the frontend.

src/helm/impress/Chart.yaml

@@ -1,5 +1,5 @@
 apiVersion: v2
 type: application
 name: docs
-version: 0.0.2
+version: 2.0.1-beta.7
 appVersion: latest