Add CSS selector for "today" similar to .task-date.task-overdue

[argenos]

Is your feature request related to a problem? Please describe. To style the task metadata, it's possible to style two types of dates: overdue and all the other dates. On todoist, you get four colours: red for overdue, orange for tomorrow, green for today and purple for the rest. I'd settle for having three of those sort of past/present/future.

Describe the solution you'd like Having a selector for "Today" equivalent to .task-date.task-overdue

Describe alternatives you've considered N/A

Additional context N/A