Swipe left on navigation bar to go back to previous position on last opened thread

**Is your feature request related to a problem? Please describe.**

Sometimes after reading through a thread and you go back to the feed and scroll you realize a reply you could post to a comment to help a user. Apollo had a great feature where you could swipe on the bottom navigation bar and it would take you to your position on the thread you were just in

**Describe the solution you'd like**

Swipe on bottom navigation bar to go back to your position in the thread you were just in.