add files for main page
edit gitignore to add presentations
add presentations
Merge branch 'hotfix/change_main_page' into develop

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

* 'develop' of github.com:ulmic/nastachku:
  add handling mail error
  change login password from mailtrap