Remove sharing/comments from post layout

We don't want/need sharing or disqus, and we don't want to have to
disabled them on each article.

Change-Id: I9ff8b1c7a44919e7cc71857d62e0ceb474f4f7dd
Reviewed-on: https://gerrit.causes.com/23119
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>
Fix 'Read on' link styling

The line-height wasn't quite right, causing the arrow to be too
vertically high.

The CSS already inserts an arrow using Font Awesome before the link, so
the &rarr; was extraneous and distracting.

I also gave Joe's manual 'Read on' link the same class so that it looks
the same.

Change-Id: I9ccf1e8c0df0397b7e906653372f1372a6cd0afa
Reviewed-on: https://gerrit.causes.com/23122
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@causes.com>