Enabled extending css imports in the theme. Corrected link list on the index page.

_includes/css-imports.html

+{% comment %}
+  Insert here CSS <link/> tags, and <style/> tags if needed.
+{% endcomment %}
\ No newline at end of file

_includes/head.html

@@ -7,6 +7,8 @@
   <link rel="stylesheet" href="{{ "/assets/main.css" | relative_url }}">
   <link rel="stylesheet" href="{{ '/assets/fontawesome/css/fontawesome-all.min.css' | relative_url }}">
 
+  {%- include css-imports.html -%}
+
   {%- if jekyll.environment == 'production' and site.google_analytics -%}
     {%- include google-analytics.html -%}
   {%- endif -%}

_includes/header.html

@@ -40,7 +40,7 @@
             {%- assign my_pages = site.pages | sort:"order" -%}
 
             {%- for my_page in my_pages -%}
-              {%- if my_page.title -%}
+              {%- if my_page.title and my_page.autogen == nil -%}
                 {%- if page.url == my_page.url -%}
               <a class="page-link active" href="{{ my_page.url | relative_url }}">{{ my_page.title | escape }}</a>
                 {% else %}

_includes/scripts.html

 {% comment %}
-Uncomment those if needed
+   Add here additional javascript libraries and code.
+   Uncomment those if needed.
 {% endcomment %}
+
 {% comment %}
 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
 <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>