remove hardcoding of social-share-section and expose reddit option in config file; fixes #1440

Author: daattali

_config.yml

@@ -98,6 +98,7 @@ share-links-active:
   facebook: true
   linkedin: true
   vk: false
+  reddit: false
 
 # How to display the link to your website in the footer
 # Remove this if you don't want a link in the footer

assets/css/beautifuljekyll.css

@@ -944,10 +944,6 @@ pre {
   margin-top: 1.875rem;
 }
 
-#social-share-section a {
-  color: #fff;
-}
-
 /* --- Notification boxes --- */
 .box-note,
 .box-warning,