[website] Remove Spice logo from sponsor section.
The project requested to be removed from the page.
Thank you to the Spice Token project for your support.
Built and ran it locally
Confirmed with Spice people that they want their logo removed.
Reviewers: johnkuney, jasonbcox, deadalnix, #bitcoin_abc, josephroyking
Reviewed By: #bitcoin_abc, josephroyking
Differential Revision: https://reviews.bitcoinabc.org/D8574