replace huh with promptui

- it gives more control over filtering

add --filter/-f flag, this allows configuration over a prefix vs contains filter

update the README to reflect changes

main.go

@@ -55,6 +55,8 @@ You may also list available templates and generate .gitignore files based on tho
 func init() {
 	rootCmd.PersistentFlags().StringP("token", "t", "", "GitHub authentication token")
 	rootCmd.PersistentFlags().IntP("height", "H", 20, "Height of the selection prompt")
+	rootCmd.PersistentFlags().
+		StringP("filter", "f", "startswith", "Type of filter to apply to the list of templates (e.g., 'startswith', 'contains')")
 
 	rootCmd.Flags().BoolP("version", "v", false, "Print the version of the CLI")
 
@@ -62,6 +64,7 @@ func init() {
 	viper.AutomaticEnv()
 	viper.BindPFlag("token", rootCmd.PersistentFlags().Lookup("token"))
 	viper.BindPFlag("height", rootCmd.PersistentFlags().Lookup("height"))
+	viper.BindPFlag("filter", rootCmd.PersistentFlags().Lookup("filter"))
 }
 
 // main is the entry point of the application.