feat(social): improve social links (#254)

* replace forkawesome and iconfont with simple icons
* add more configs for social

assets/css/_partial/_single/_footer.scss

@@ -39,6 +39,12 @@
 
         @include link(false, false);
       }
+
+      .post-info-share {
+        a * {
+          vertical-align: text-bottom;
+        }
+      }
     }
   }