title: Add custom slug to link for WP default posts
body: <p>How can I modify default posts permalink?
  E.g. www.example.com/post-slug/ i need to change to www.example.com/blog/post-slug/
  I need this only for default wp posts, I have achieved the same with adding custom post type (www.example.com/portfolio/portfolio/portfolio-slug, but I hope there is a cleaner way for default wp posts)</p>