Use the (correct) TNO logo on the membership page

As discussed with @gblondelle by email and as agreed upon by our (TNO's) legal department:

Please list our organization as a supporter of the OSPO Alliance on the ospo.zone website. We reserve the right to get our listing removed at any time by submitting a new issue requesting this removal.

Here is the correct logo, with transparent background instead of the white background that the logo uses that is currently on the website: