Fix spacing issue when using navigation.sections without navigation.tabs (#13)

Author: michalc

tech_docs_template/assets/stylesheets/extra.css

@@ -99,8 +99,10 @@
   border-left-color:   #1d70b8;
 }
 
+.md-nav__item--section > .md-nav > .md-nav__list > .md-nav__item--active,
 .md-nav--secondary .md-nav__link--active {
   /* font-weight: 700;  */
+  margin-left:  0;
   padding-left: 3px;
   border-left: 3px solid;
   border-left-color:   #1d70b8;