add filters to server websites list

app/controllers/admin/application_controller.rb

app/controllers/concerns/admin/filterable.rb

app/controllers/server/application_controller.rb

app/controllers/server/websites_controller.rb

app/models/communication/website.rb

...models/communication/website/configs/default_languages.rb

...odels/communication/website/configs/default_permalinks.rb

...odels/communication/website/configs/development_config.rb

...models/communication/website/configs/production_config.rb

app/models/university/person.rb

app/models/university/person/administrator.rb

app/models/university/person/alumnus.rb

app/models/university/person/author.rb

app/models/university/person/researcher.rb

app/models/university/person/teacher.rb

app/services/filters/server/websites.rb

app/views/admin/users/index.html.erb

app/views/server/websites/index.html.erb

...30210132818_add_default_value_to_website_theme_version.rb

db/schema.rb