RancherOS: add date and time zone page (rancher#1714)

* RancherOS: add date and time zone page

* Copy edit time zone data page for RancherOS

Merge pull request rancher#1299 from rancher/staging

v2.2 Docs

Add something about how to custom partition layout

Merge pull request rancher#451 from MBishop17/undraft-storage

Undraft storage/resources

Merge pull request rancher#322 from StrongMonkey/fix-import

add gke import tips

Add step to get Rancher logging in HA

Add step to get Rancher logging in HA