docs: first pass of krata as an isolation engine

crates/daemon/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "krata-daemon"
-description = "Daemon for the krata hypervisor."
+description = "Daemon for the krata isolation engine"
 license.workspace = true
 version.workspace = true
 homepage.workspace = true

crates/daemon/src/command.rs

@@ -6,7 +6,7 @@ use std::str::FromStr;
 use crate::Daemon;
 
 #[derive(Parser)]
-#[command(version, about = "Krata hypervisor daemon")]
+#[command(version, about = "krata isolation engine daemon")]
 pub struct DaemonCommand {
     #[arg(
         short,