Auto unpinning & jumping to end of topic

[bloomexperiment (Tracey)]

There is a category setting Navigate to first post after topics are read that can be used for documentation type categories

Navigate to first post after topics are read, category setting

Per this commit categories have a new setting that allows administrators to amend the behavior of fully read topics. Out-of-the-box logged-on-users will navigate to the last post in a topic after they are done reading it. This is not ideal for documentation type categories such as #howto and so on where you often want to re-read the OP a few times. This is a per category setting, to enable this special behavior tick Navigate to first post after topics are read in category settings on the desig…