Update command descriptions (#353)

Cool tagline to be determined.

cmd/bundle/root.go

@@ -8,7 +8,7 @@ import (
 // rootCmd represents the root command for the bundle subcommand.
 var rootCmd = &cobra.Command{
 	Use:   "bundle",
-	Short: "Databricks Application Bundles",
+	Short: "Databricks Asset Bundles",
 }
 
 func AddCommand(cmd *cobra.Command) {

cmd/root/root.go

@@ -15,8 +15,7 @@ import (
 // RootCmd represents the base command when called without any subcommands
 var RootCmd = &cobra.Command{
 	Use:   "bricks",
-	Short: "Databricks project lifecycle management",
-	Long:  `Where's "data"? Secured by the unity catalog. Projects build lifecycle is secured by bricks`,
+	Short: "Bricks CLI",
 
 	// Cobra prints the usage string to stderr if a command returns an error.
 	// This usage string should only be displayed if an invalid combination of flags