FIX: Back button out of alignment (#31)

Core made buttons to use flexbox recently, which changed the behavior of
the go back button on Docs topics. The local justify-content declaration
overrides the core declaration causing problems.

assets/stylesheets/common/docs.scss

@@ -165,6 +165,7 @@
         color: $tertiary;
         display: inline-flex;
         font-size: $font-down-1;
+        justify-content: normal;
         padding: 0;
         &::before {
           content: "«";