[website] Remove Spice logo from sponsor section.
Summary:
The project requested to be removed from the page.
Thank you to the Spice Token project for your support.
Test Plan:
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
Subscribers: josephroyking
Differential Revision: https://reviews.bitcoinabc.org/D8574