Drop old templates and static files

aleksis/apps/alsijil/static/css/alsijil/alsijil.css

aleksis/apps/alsijil/static/css/alsijil/lesson.css

aleksis/apps/alsijil/static/css/alsijil/person.css

aleksis/apps/alsijil/static/css/alsijil/week_view.css

aleksis/apps/alsijil/static/js/alsijil/week_view.js

...sis/apps/alsijil/templates/alsijil/absences/register.html

.../alsijil/templates/alsijil/absences/register_confirm.html

...alsijil/templates/alsijil/class_register/all_objects.html

...apps/alsijil/templates/alsijil/class_register/groups.html

...apps/alsijil/templates/alsijil/class_register/lesson.html

...apps/alsijil/templates/alsijil/class_register/person.html

...pps/alsijil/templates/alsijil/class_register/persons.html

...sijil/templates/alsijil/class_register/students_list.html

...s/alsijil/templates/alsijil/class_register/week_view.html

...is/apps/alsijil/templates/alsijil/excuse_type/create.html

aleksis/apps/alsijil/templates/alsijil/excuse_type/edit.html

aleksis/apps/alsijil/templates/alsijil/excuse_type/list.html

...s/apps/alsijil/templates/alsijil/excuse_type/warning.html

...s/apps/alsijil/templates/alsijil/notifications/check.html

...ps/alsijil/templates/alsijil/partials/lesson/heading.html