remove unused models

...rollers/admin/communication/website/authors_controller.rb

app/controllers/admin/education/teachers_controller.rb

app/controllers/admin/research/researchers_controller.rb

app/models/ability.rb

app/models/communication/website.rb

app/models/communication/website/author.rb

app/models/communication/website/imported/author.rb

app/models/education/teacher.rb

app/models/research/researcher.rb

app/models/user.rb

app/views/admin/communication/website/authors/index.html.erb

app/views/admin/communication/websites/_sidebar.html.erb

app/views/admin/communication/websites/import.html.erb

...views/admin/communication/websites/show/_authors.html.erb

app/views/admin/education/teachers/_list.html.erb

app/views/admin/education/teachers/index.html.erb

app/views/admin/research/researchers/index.html.erb

config/admin_navigation.rb

config/locales/communication/en.yml

config/locales/communication/fr.yml