update docs

README.md

@@ -9,7 +9,6 @@ Set the following environment variables:
 - `MATRIX_URL`: the url of the matrix homeserver
 - `MATRIX_ID`: the user id of the bot on this server
 - `MATRIX_PW`: the password for this user
-- `ROOM_ID`: the room on which send the notifications
 
 ## Dev
 
@@ -20,14 +19,16 @@ pip3 install --user matrix-client
 
 ## Prod
 
-With a proxyta.net:
-(don't forget about `CHATONS_DOMAIN`, otherwise you will stay on `localhost`)
+- Use [Traefik](https://traefik.io/) on the `web` docker network, eg. with
+  [proxyta.net](https://framagit.org/oxyta.net/proxyta.net)
+- Put the configuration into a `.env` file (don't forget about `CHATONS_DOMAIN`, otherwise by default you will stay on
+  `localhost`)
 
 ```
 docker-compose up -d
 ```
 
-## Test
+## Test / Usage
 
 ```
 curl -d '{"text":"new contrib from toto: http://radio.localhost/map/#44", "key": "secret"}' mwh.localhost