PostHog feature flag api errors impacting on accessim.org

The issue with PostHog has been resolved.

PostHog has released a fix and they are monitoring the results. Some functionality may return to accessim.org. We will update when PostHog confirms they've resolved the issue on their end, and we will confirm things should be working on ours.

PostHog feature flag api errors are making some features on accessim.org inaccessible. This includes features like math tools that only show up if the relevant feature flag is set to true. Since the app can't get the result of the feature flag, it defaults to false, thus hiding the feature. Engineering is monitoring PostHog status updates, and will update when we have more information.