Remove deprecated usage of adopters
Resolves eclipsefdn/it/api/eclipsefdn-project-adopters#188
Related to eclipsefdn/it/websites/eclipse.org#221
Several months ago adopters has been updated to use ES6+, remove jQuery, and support templating. The adopters also have their own API functions in EFSA under /js/api/.
The change introduced by this MR removes a piece of code from the original adopters that should've been removed with the addition of the updated adopters. It should remove the error we receive in console.log under eclipse.org and other Hugo sites.