Add on-call current timeline indication

[zdzielinski]

Is your feature request related to a problem? Please describe. Just a feature suggestion from what I've seen of the demo images, I haven't actually used it yet.

Describe the solution you'd like Having a timeline indication (IE, a bar or something similar) to show where in the beginning to end of the viewed person's on-call timeline you are currently at. It would be easier to see how much longer they are on call for at a glance rather than deciphering the date format itself.

[sergiitk]

This is an amazing idea! Thank you for the contribution, adding to my list.