CLI: naming clean-up. (#897)

* Small naming clean up.

* Small naming clean up.

* Add Rococo module to CLI

Co-authored-by: Svyatoslav Nikolsky <svyatonik@gmail.com>
Co-authored-by: Hernando Castano <hernando@hcastano.com>

bridges/relays/bin-substrate/src/main.rs

@@ -20,6 +20,7 @@
 
 use relay_utils::initialize::initialize_logger;
 
+mod chains;
 mod cli;
 mod finality_pipeline;
 mod finality_target;
@@ -29,8 +30,6 @@ mod messages_source;
 mod messages_target;
 mod on_demand_headers;
 
-mod rialto_millau;
-
 fn main() {
 	initialize_logger(false);
 	let command = cli::parse_args();