feature: updated guest information and picture

Signed-off-by: Batuhan Apaydın <batuhan.apaydin@trendyol.com>

Author: developer-guy

_posts/2020-10-27-kubernetes-webhooks-made-easy-with-openfaas.md

@@ -35,6 +35,7 @@ Webhook Admission Server is just plain http server that adhere to Kubernetes API
 * Kubernetes API -> Webhook (w/TLS) -> OpenFaaS Gateway (w/HTTP) -> OpenFaaS Function
 
 ![Workflow](/images/2020-10-27-k8s-validatingwebhook-openfaas/admission-controller-phases.png)
+> Credit: [https://kubernetes.io/blog/2019/03/21/a-guide-to-kubernetes-admission-controllers/](https://kubernetes.io/blog/2019/03/21/a-guide-to-kubernetes-admission-controllers/)
 
 Supporting TLS for external webhook server is also required because admission is a high security operation. As part of the process, we need to create a TLS certificate signed by the Kubernetes CA to secure the communication between the webhook server and apiserver.
 

_staff_members/developer-guy.md

@@ -1,8 +1,8 @@
 ---
 name: Batuhan Apaydın
 position: Guest
-image_path: https://avatars0.githubusercontent.com/u/16693043?s=460&u=76efd879df78e6fd68b572bc3278b75926ecaa6d&v=4
-# twitter_username: rajatjindal1983
+image_path: /images/author/developer-guy.png
+linkedin_username: bthnapydin
 github_username: developer-guy
-blurb: Life-long learner. Software engineer
+blurb: Life-long learner. Software engineer at <a href="https://www.trendyol.com">@Trendyol</a>
 ---