fix(doc): bolder font for the navigation

Author: Shipow

docs/css/_documentation.sass

@@ -12,7 +12,8 @@
   height: 100%
   overflow-y: auto
   padding: 0
-  font-size: 1.3em
+  font-size: 1.2em
+  font-weight: bold
   > ul
     line-height: 2em
     list-style: none
@@ -32,7 +33,7 @@
         color: $brand-primary
         text-decoration: none
     ul
-      font-size: .80em
+      font-size: .85em
       padding: 0 0 5px 10px
       line-height: 1.7em
       list-style: none