Perses finale (#558)

* Move v2 routes to v2 module

* Remove v1 routes and make it run

* Make config declaration consistent, add v3 module

* Readd API v1 msgs

* Fix imports

src/routes/v3/mod.rs

@@ -0,0 +1,13 @@
+pub use super::ApiError;
+use actix_web::{web, HttpResponse};
+use serde_json::json;
+
+pub fn config(cfg: &mut web::ServiceConfig) {
+    cfg.service(web::scope("v3").route("", web::get().to(hello_world)));
+}
+
+pub async fn hello_world() -> Result<HttpResponse, ApiError> {
+    Ok(HttpResponse::Ok().json(json!({
+        "hello": "world",
+    })))
+}