Revert "Add missing comment-link styles to header"

This reverts commit 27f956d.

No evidence of these being in any HTML generated...so not sure what the
history was there...but we do not seem to need these now.

Author: BigBlueHat

www/_partials/header.html

@@ -86,13 +86,6 @@
   margin-left: 2em;
 }
 
-.comment-link {
-  display: none;
-}
-.comment:hover .comment-link {
-  display: inline;
-}
-
 div.proposal {
   padding: 15px;
   margin: 20px 0px 20px 0px;