Add title to nav_list helper

_docs/01-quick-start-guide.md

@@ -3,6 +3,7 @@ title: "Quick-Start Guide"
 permalink: /docs/quick-start-guide/
 excerpt:
 sidebar:
+  title: "v3.0"
   nav: docs
 ---
 

_docs/02-structure.md

@@ -3,6 +3,7 @@ title: "Structure"
 permalink: /docs/structure/
 excerpt:
 sidebar:
+  title: "v3.0"
   nav: docs
 ---
 

_docs/03-installation.md

@@ -3,6 +3,7 @@ title: "Installation"
 permalink: /docs/installation/
 excerpt:
 sidebar:
+  title: "v3.0"
   nav: docs
 ---
 

_docs/04-upgrading.md

@@ -3,6 +3,7 @@ title: "Upgrading"
 permalink: /docs/upgrading/
 excerpt:
 sidebar:
+  title: "v3.0"
   nav: docs
 ---
 

_docs/docs-2.md

@@ -2,6 +2,7 @@
 title: "v2 Documentation"
 excerpt: "Minimal Mistakes Jekyll theme version 2 setup and installation instructions."
 sidebar:
+  title: "v3.0"
   nav: docs
 ---
 

_includes/nav_list

@@ -2,6 +2,7 @@
 {% assign navigation = site.data.navigation[page.sidebar.nav] %}
 
 <nav class="nav__list">
+  {% if page.sidebar.title %}<header><h4>{{ page.sidebar.title }}</h4></header>{% endif %}
   <ul>
     {% for nav in navigation %}
       <li><span class="nav__sub-title">{{ nav.title }}</span>