Visualize nested tags in example

Signed-off-by: Oleg Bulatov <oleg@bulatov.me>
Add link to gh-pages to README.md

Signed-off-by: Oleg Bulatov <oleg@bulatov.me>
Merge branch 'master' into gh-pages

* master:
  Add link to gh-pages to README.md
  Visualize nested tags in example