docs: rewrite getting-started for ISO

Update the Getting Started documentation to reflect the new ISO-based installation method. Fixes #3016 Signed-off-by: Seán C McCord <ulexus@gmail.com>
siderolabs · Mar 12, 2021 · 1362966 · 1362966
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diff --git a/pkg/machinery/constants/constants.go b/pkg/machinery/constants/constants.go
@@ -66,6 +66,8 @@ const (
 
 	// KernelCurrentRoot is the kernel parameter name for specifying the
 	// current root partition.
+	//
+	// Deprecated: Talos now expects to use an entire disk.
 	KernelCurrentRoot = "talos.root"
 
 	// NewRoot is the path where the switchroot target is mounted.