Add navbar component, Fix JS highlight

sass/elements/content.sass

@@ -54,12 +54,10 @@
   ol
     list-style: decimal outside
     margin-left: 2em
-    margin-right: 2em
     margin-top: 1em
   ul
     list-style: disc outside
     margin-left: 2em
-    margin-right: 2em
     margin-top: 1em
     ul
       list-style-type: circle
@@ -67,22 +65,22 @@
       ul
         list-style-type: square
   dd
-    margin-left: 2em
-  figure
-    text-align: center
-    img
-      display: inline-block
-    figcaption
-      font-style: italic
-  pre
+    margin-left: 2em
+  figure
+    text-align: center
+    img
+      display: inline-block
+    figcaption
+      font-style: italic
+  pre
     +overflow-touch
     overflow-x: auto
     padding: 1.25em 1.5em
     white-space: pre
-    word-wrap: normal
-  sup,
-  sub
-    font-size: 70%
+    word-wrap: normal
+  sup,
+  sub
+    font-size: 70%
   table
     width: 100%
     td,