Merge branch 'hotfix/many_fixes'

* hotfix/many_fixes:
  add genre link to index welcome
add info about video from youtube
Merge branch 'develop'

* develop:
  add info about video from youtube
fotorama is working
fix teacher decorator
Merge branch 'hotfix/problem_with_fotorama' into develop

* hotfix/problem_with_fotorama:
  fix teacher decorator
  fotorama is working