As a user that's not involved in the division, I want to see old committees and current committees in the main page banner and current committees in each committes page banner, so that I can see both past and current people in committees

### Description

Currently a random image is displayed on the main page, some committees have older images from previous committees still saved, which makes them show on the main page. This is nice as i can see the people in the committees from previous years, however when i go to a committees page then a random image from that committe is displayed there.

Having only the image of the current committe on the committe would make it so that i can find out which people are currently active, while still being able to see the people from committees on the main page.

### Definition of Done

- [ ] The main page shows a random banner, from all committees and all years
- [ ] Each committee's page shows the people active in that committee