feat: Add emojis and improve help output for ghostkey command

rust/cli/src/bin/ghostkey.rs

@@ -37,10 +37,11 @@ fn main() {
 }
 
 fn run() -> i32 {
-    let matches = Command::new("Freenet Ghost Key Utility")
+    let matches = Command::new("👻🔑 Freenet Ghost Key Utility")
         .version(env!("CARGO_PKG_VERSION"))
         .author("Ian Clarke <[email protected]>")
         .about("Utility for generating and verifying Freenet ghost keys")
+        .after_help("Run 'ghostkey <COMMAND> -h' for more information on a specific command.")
         .subcommand(
             Command::new(CMD_VERIFY_GHOST_KEY)
                 .about("Verifies a ghost certificate")
@@ -59,6 +60,8 @@ fn run() -> i32 {
                         .value_name("FILE"),
                 ),
         )
+        .subcommand_required(true)
+        .arg_required_else_help(true)
         .subcommand(
             Command::new(CMD_GENERATE_MASTER_KEY)
                 .about("Generate a new master keypair")
@@ -386,7 +389,12 @@ fn run() -> i32 {
             verify_signed_message_cmd(signed_message_file, &master_verifying_key, output_file)
         }
         _ => {
-            info!("No valid subcommand provided. Use --help for usage information.");
+            println!("👻🔑 Welcome to the Freenet Ghost Key Utility!");
+            println!("Use 'ghostkey -h' for detailed usage information.");
+            println!("Available commands:");
+            for (name, cmd) in matches.get_subcommands() {
+                println!("  {} - {}", name, cmd.get_about().unwrap_or(""));
+            }
             0
         }
     }