Refine look for post listing on user homepage

- Don't use truncatewords to truncate post content
    - This could lead to issues because the first 100 characters could contain
      a code block.  We don't want to truncate INSIDE of a code block because
      it looks bad.  So, ultimately we will want to have a smarter truncate
      template tag that will handle code blocks.
    - For now we will just show titles on listing.  This still looks pretty
      good anyway so maybe it will stick.