docs: revert certificates.dev description (#1128)

README.md

@@ -325,7 +325,7 @@ Current Angular version: [![npm version](https://badge.fury.io/js/%40angular%2Fc
 
 ##### Certification
 
-* [Certificates.dev](https://certificates.dev/angular) - **[UNLIMITED ACCESS TO ANGULAR MID-LEVEL CERTIFICATION TRAINING NOW LIVE](https://certificates.dev/angular/free-weekend)** Includes all theory, coding challenges, quizzes, and even a mock exam!
+* [Certificates.dev](https://certificates.dev/angular) - Obtain your Certification of Competence as an Angular Developer.
 * [Angular Academy CA](https://www.angularacademy.ca/angular-certification) - Angular Academy is the #1 provider of hands-on instructor-led classroom training in Canada!
 * [Hackerrank](https://www.hackerrank.com/skills-verification/angular_basic) - Angular (Basic) Skills Certification Test.
 * [Edureka](https://www.edureka.co/angular-training) - Angular Certification Course Online.