ability to swap out a room

.env.example

@@ -60,6 +60,17 @@ RECFLARE_DOMAIN=rec.example.com
 # RECFLARE_MAX_ROOMS_PER_ACCOUNT=10
 # RECFLARE_MAX_CLUBS_PER_ACCOUNT=10
 
+# Rooms to switch out at matchmake time (`match`), as comma-separated <fromRoomId>=<to>
+# pairs, where <to> is a room id or room name. This is how a stock RRO room is replaced
+# with your own: 2=MyHub sends everyone who matchmakes into the Rec Center (room 2) to the
+# room named MyHub instead, whether the client asked for it by id or by name, and whether
+# it came through the room list, a club's clubhouse, or a party. Substitution is a single
+# hop (2=3,3=2 swaps the two rooms), a requested subroom is dropped in favour of the
+# substitute's default one, and a target that doesn't exist leaves the original room in
+# place. Following a friend or joining a specific instance is unaffected — those join a
+# live instance, which is already in whichever room it was created in.
+# RECFLARE_ROOM_REDIRECTS=2=MyHub
+
 # RecCenterTokens a new player is granted, the first time their balance is read (`econ`).
 # 0 means players start broke. Applies only to players who haven't been granted yet —
 # raising it later does NOT top up existing players.