doc: update w/r last Docker image changes

docs/user/rpc.md

@@ -7,20 +7,12 @@
 - Add this docker-compose template on your server:
   [docker/compose/gdev-rpc.docker-compose.yml](https://git.duniter.org/nodes/rust/duniter-v2s/-/blob/master/docker/compose/gdev-mirror.docker-compose.yml)
 - Rename the file : `mv gdev-mirror.docker-compose.yml docker-compose.yml`
-- In the same folder, create a `.env` file that defime environment variables `SERVER_DOMAIN` and `PEER_ID`:
+- In the same folder, create a `.env` file that defime environment variables `SERVER_DOMAIN`:
 
 ```bash
 SERVER_DOMAIN=YOUR_DOMAIN
-PEER_ID=YOUR_PEER_ID
 ```
 
-Your `PEER_ID` shoud be generated with this command:
-
-```bash
-docker run --rm -it --entrypoint duniter -v $PWD:/var/lib/duniter/  duniter/duniter-v2s:v0.4.0 key generate-node-key --file /var/lib/duniter/node.key
-```
-
-- If you have write access errors run in docker-compose.yml folder : `chmod o+rwX -R .`
 - Do `docker compose up -d` to start your node
 
 ### Reverse-proxy part (with Nginx)