(feat) rework reactive system

aep-schedule-website/src/frontend/app.rs

...bsite/src/frontend/components/options/courses_selector.rs

aep-schedule-website/src/frontend/components/options/form.rs

...edule-website/src/frontend/components/options/personal.rs

...chedule-website/src/frontend/components/options/search.rs

...schedule-website/src/frontend/components/options/state.rs

aep-schedule-website/src/frontend/components/options/todo.rs

aep-schedule-website/src/frontend/components/schedules.rs

aep-schedule-website/style/main.scss

aep-schedule-website/style/options.scss