Moved documentation from utPLSQL sub-project into main utPLSQL.github.io

Added filtering n items to show on top-level menu.

Author: jgebal

.gitignore

@@ -1,4 +1,6 @@
 _site
 .sass-cache
 .jekyll-metadata
-.idea
+.idea
+/.jekyll-cache/
+/Gemfile.lock

_includes/header.html

@@ -16,7 +16,9 @@
       <div class="trigger">
         {% for my_page in site.pages %}
           {% if my_page.title %}
-          <a class="page-link" href="{{ my_page.url | prepend: site.baseurl }}">{{ my_page.title }}</a>
+            {% if my_page.menuInclude %}
+              <a class="page-link" href="{{ my_page.url | prepend: site.baseurl }}">{{ my_page.title }}</a>
+            {% endif %}
           {% endif %}
         {% endfor %}
       </div>