Only show verified organizations on Explore Contributors page

[SimoneZaza]

Description

As an organization, I don't want my logo to be shown on the contributors page if I didn't verify that it's indeed our organization

Acceptance criteria

• [ ] In the organizations block on the Find Contributors page (https://alkem.io/contributors) only show organizations that are verified (16)

Additional Context

Screen shots / UX designs / data that are relevant.

Areas that will be affected

To be added during the refinement