Released version 3.0

  * Added templates for:
    * Main navigation
    * Next/previous page navigation
    * "No posts found" message
    * Search form
  * Removed search form function (replaced with WordPress standard
`searchform.php` template).
  * Cleaned up  code and removed some unused snippets.
  * Added `get_template_directory()` to `require_once` in
`functions.php`.