remove date from display and format for openscholar-style RSS #3951

#3951 

After receiving the test RSS feed from an openscholar site, I discovered a few things that needed tweaks:

### Changes

* **Minor JS formatting removed: fuzzy date** The contentSnippet for news feed items contains a date at the beginning of the content, making the formatted date prefix like "5 days ago" unnecessary.
* **Minor CSS tweak: margin top** Test RSS feeds had much shorter descriptions. When the description is longer, the "Next" button overlapped the text.