Update README on upgrade notes 1.18->1.19

chore(istio) added example on deploying and undeploying istio layer

improve(autoscaling group) stored previous approach with autoscaling group for future considerations

improve(cluster) adjusted for use with EKS 1.18, + optional alb load balancer, external dns

chore(Readme) eliminated older references to heptio authentificator

improve(draft) adjusted example to cover alb loadbalancer and external-dns

improve(draft) adjusted example to cover alb loadbalancer and external-dns

Merge branch '1.16'

revised readme

Merge pull request #2 from Voronenko/1.16

improve(1.16) adjusted to currently advertised on aws 1.16

chore(readme)

chore(readme) adjusted info about deploying kubernetes management panel

fix(instance profile) added possibility for creation multiple clusters in the same zone

chore(readme) unsorted notes on creation