Fix font-family: inherit serif font for help text link

The .content_links a rule sets sans-serif font-family globally.
Override with font-family: inherit so the Learn more link matches
the surrounding serif body text.

Signed-off-by: Tim Ren <137012659+xr843@users.noreply.github.com>

Author: xr843

assets/css/content-perma.scss

@@ -150,6 +150,7 @@ div.content_links {
         a {
             text-decoration: underline;
             color: inherit;
+            font-family: inherit;
         }
     }
 }