[en] update kubernetes link

Author: Arhell

content/en/case-studies/blablacar/index.html

@@ -20,7 +20,7 @@ <h2>Challenge</h2>
 
 <h2>Solution</h2>
 
-<p>Opting not to shift to cloud virtualization or use a private cloud on their own servers, the BlaBlaCar team became early adopters of containerization, using the CoreOs runtime <a href="https://coreos.com/rkt">rkt</a>, initially deployed using <a href="https://coreos.com/fleet/docs/latest/launching-containers-fleet.html">fleet</a> cluster manager. Last year, the company switched to <a href="http://kubernetes.io/">Kubernetes</a> orchestration, and now also uses <a href="https://prometheus.io/">Prometheus</a> for monitoring.</p>
+<p>Opting not to shift to cloud virtualization or use a private cloud on their own servers, the BlaBlaCar team became early adopters of containerization, using the CoreOs runtime <a href="https://coreos.com/rkt">rkt</a>, initially deployed using <a href="https://coreos.com/fleet/docs/latest/launching-containers-fleet.html">fleet</a> cluster manager. Last year, the company switched to <a href="https://kubernetes.io/">Kubernetes</a> orchestration, and now also uses <a href="https://prometheus.io/">Prometheus</a> for monitoring.</p>
 
 <h2>Impact</h2>