Add redirects for operator 1.3.0 and 1.4.0

Author: stktung

docs/.vuepress/public/_redirects

@@ -270,6 +270,10 @@
 /server/v5/server/*         /server/v5/introduction.html    301
 /server/v5/streams/*        /server/v5/introduction.html    301
 
+# k8 Operator
+/server/kubernetes-operator/v1.3.0/*                             /server/kubernetes-operator/latest/:splat                     301
+/server/kubernetes-operator/v1.4.0/*                             /server/kubernetes-operator/latest/:splat                     301
+
 # ######################
 # Other
 # ######################