* [MixologyBridge] add null checks for author and timestamp elements * [MixologyBridge] fix formatting
* [MixologyBridge] adapt to latest site changes * [MixologyBridge] fix category selector
* [MixologyBridge] add new bridge * [MixologyBridge] change invalid item property tags to categories * [MixologyBridge] rewrite into FeedExpander * [MixologyBridge] fix code formatting