V2 removal and _internal rerouting (#770)

* deleteed v3 exclusive routes

* moved routes around

* fixed linkage that movement broke

* initial merge errors

* fixes

src/routes/internal/mod.rs

@@ -0,0 +1,21 @@
+mod admin;
+pub mod flows;
+pub mod pats;
+pub mod session;
+
+use super::v3::oauth_clients;
+pub use super::ApiError;
+use crate::util::cors::default_cors;
+
+pub fn config(cfg: &mut actix_web::web::ServiceConfig) {
+    cfg.service(
+        actix_web::web::scope("_internal")
+            .wrap(default_cors())
+            .configure(admin::config)
+            // TODO: write tests that catch these
+            .configure(oauth_clients::config)
+            .configure(session::config)
+            .configure(flows::config)
+            .configure(pats::config),
+    );
+}