Merge pull request #234 from noesya/fix-firefox-post-share

Fix firefox post share alignment

assets/sass/_theme/sections/posts.sass

@@ -147,10 +147,12 @@
         @include link($color-accent)
         text-align: right
     .share
-        justify-content: flex-end
+        display: block
+        li
+            display: inline-block
         a
             color: inherit
-        li:last-child a
+        li:last-child
             margin-right: -$spacing0
 
 .related