Add more button next to blog post excerpts

Like on event page there is a more button next to blog post excerpts
now.
2 jobs for 36-more-button-for-blog-posts in 3 minutes (queued for 1 second)
Status Job ID Name Coverage
  Build
passed run_jekyll_latest_dependencies #68519

00:02:55

passed run_jekyll_production #68520

00:03:00