Move coco env deploy to the top-level, coco deploy

Deployments are central to the entire system; although technically
a deployment is indeed associated with an environment, the deployment
is the focus, not the environment, so it makes sense to put the
deployment command at the top-level.

Before, you'd say:

    $ coco env deploy production

And now, you will say:

    $ coco deploy production

cmd/coconut.go

@@ -41,6 +41,7 @@ func NewCoconutCmd() *cobra.Command {
 	cmd.PersistentFlags().IntVarP(
 		&verbose, "verbose", "v", 0, "Enable verbose logging (e.g., v=3); anything >3 is very verbose")
 
+	cmd.AddCommand(newDeployCmd())
 	cmd.AddCommand(newEnvCmd())
 	cmd.AddCommand(newPackCmd())
 	cmd.AddCommand(newVersionCmd())

cmd/deploy.go

@@ -6,7 +6,7 @@ import (
 	"github.com/spf13/cobra"
 )
 
-func newEnvDeployCmd() *cobra.Command {
+func newDeployCmd() *cobra.Command {
 	var dryRun bool
 	var showConfig bool
 	var showReplaceSteps bool

cmd/env.go

@@ -36,16 +36,15 @@ import (
 func newEnvCmd() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "env",
-		Short: "Manage or deploy into a target environment",
-		Long: "Manage or deploy into a target environment\n" +
+		Short: "Manage target environments",
+		Long: "Manage target environments\n" +
 			"\n" +
-			"An environment is a named deployment target, and a single nut have many of them.  Each\n" +
-			"environment has a configuration and deployment history associated with it, stored in the\n" +
-			"workspace, in addition to a full checkpoint of the last known good deployment.\n",
+			"An environment is a named deployment target, and a single project may have many of them.\n" +
+			"Each environment has a configuration and deployment history associated with it, stored in\n" +
+			"the workspace, in addition to a full checkpoint of the last known good deployment.\n",
 	}
 
 	cmd.AddCommand(newEnvConfigCmd())
-	cmd.AddCommand(newEnvDeployCmd())
 	cmd.AddCommand(newEnvDestroyCmd())
 	cmd.AddCommand(newEnvInitCmd())
 	cmd.AddCommand(newEnvLsCmd())