fix: rearrange all portals under common portal/ folder

portal/lib/dune

@@ -1,3 +1,9 @@
+(library
+ (name portal)
+ (modules portal)
+ (virtual_modules portal)
+ (libraries lwt))
+
 (library
  (name portal_ws)
  (modules portal_ws)

portal/lib/portal_ws.ml

@@ -56,3 +56,7 @@ let ws_stream (url : string) =
            ws##.onclose :=
              Dom.handler (fun _ -> message None; Js._true);
            stream, push
+
+(* let connect domain = *)
+(*   let+ url = server_ws domain *)
+(*   in ws_stream url *)