feat: update biobox presentation link to slideshare (#525)

README.md

@@ -72,7 +72,7 @@ Organizations below are **officially** using Argo Events. Please send a PR with
 
 ## Community Blogs and Presentations
 * [Automating Research Workflows at BlackRock](https://www.youtube.com/watch?v=ZK510prml8o)
-* [Designing A Complete CI/CD Pipeline CI/CD Pipeline Using Argo Events, Workflows, and CD](https://slack-files.com/T7A4Z4285-FPJNY0GEL-8a56867830)
+* [Designing A Complete CI/CD Pipeline CI/CD Pipeline Using Argo Events, Workflows, and CD](https://www.slideshare.net/JulianMazzitelli/designing-a-complete-ci-cd-pipeline-using-argo-events-workflow-and-cd-products-228452500)
 
 ## Contribute
 Read and abide by the [Argo Events Code of Conduct](https://github.com/argoproj/argo-events/blob/master/CODE_OF_CONDUCT.md).