refacto: move home code into a dedicated file and rename index to home everywhere

crates/app/src/pages/mod.rs

@@ -1,7 +1,10 @@
 use axum::{routing, Router};
 
 mod cps;
+mod home;
 
 pub fn get_routes() -> Router {
-    Router::new().route("/cps", routing::get(cps::cps))
+    Router::new()
+        .route("/", axum::routing::get(home::home))
+        .route("/cps", routing::get(cps::cps))
 }