Move to Minikube 1.20 image of Katacoda for Hello Minikube Tutorial

Signed-off-by: Ben Hall <[email protected]>

Author: BenHall

layouts/partials/hooks/body-end.html

@@ -1,5 +1,5 @@
 {{ if .HasShortcode "kat-button" }}
-<div id="katacoda-environment" data-katacoda-ondemand="true" data-katacoda-port="30000" data-katacoda-env="minikube" data-katacoda-command="start.sh" data-katacoda-ui="panel"></div>
+<div id="katacoda-environment" data-katacoda-ondemand="true" data-katacoda-port="30000" data-katacoda-env="minikube:1.20" data-katacoda-command="start.sh" data-katacoda-ui="panel"></div>
 {{ end }}
 {{ with .Site.Params.algolia_docsearch }}
 <!-- scripts for algolia docsearch -->