Add css precompile.
Change a directory for lessons css.
Add image files for lessons.
Add lp for sp.
Change css file path.
Change css name.
Change production file.
Change css files path.
Change application.css for lessons_lp.
Add lessons1.
Fix turbolinks issue.
test1 for css.
test2 for css.
Done precompile.
Add all lesson pages.
test1 for strong params.
Change links.
Change links in pages.
Change links for pages 2.
Add Shinya's Q&A btn.