Merge branch 'hotfix/change_main_page'

* hotfix/change_main_page:
  add presentations
  edit gitignore to add presentations
  add files for main page
Merge branch 'master' of github.com:ulmic/nastachku

* 'master' of github.com:ulmic/nastachku:
  add handling mail error
  change login password from mailtrap
remove unused strings
add test
remove unused functions from lacture model
remove somthing
Merge branch 'hotfix/up_coverage' into develop

* hotfix/up_coverage:
  remove somthing
  remove unused functions from lacture model
  add test
  remove unused strings