feat: 🎸 posthog (#1931)

added bootstrap small power user

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

frontend/app/App.tsx

@@ -23,6 +23,13 @@ if (process.env.NEXT_PUBLIC_POSTHOG_KEY != null && process.env.NEXT_PUBLIC_POSTH
     {
       api_host: process.env.NEXT_PUBLIC_POSTHOG_HOST,
       opt_in_site_apps: true,
+      bootstrap:
+    {
+        distinctID: 'quivr-anonymous-id',
+        featureFlags: {
+          'small-power-user': false,
+        },
+    }
     }
   );
 }