feat: Allow specifying host and port for dev servers

- Updated `dev()` methods in Docusaurus and Starlight to accept
  host and port arguments, defaulting to `localhost:3000`.
- This allows more flexibility in development server setup.
- Updated example scripts to use the new parameters.

lib/core/herocmds/docusaurus.v

@@ -206,7 +206,7 @@ fn cmd_docusaurus_execute(cmd Command) ! {
 	}
 
 	if dev {
-		site.dev()!
+		site.dev(host: 'localhost', port: 3000)!
 	}
 
 	if open {

lib/core/herocmds/starlight.v

@@ -138,6 +138,6 @@ fn cmd_starlight_execute(cmd Command) ! {
 	}
 
 	if dev {
-		site.dev()!
+		site.dev(host: 'localhost', port: 3000)!
 	}
 }