[minor] update Dockerfile and parameters.yaml

- In the Dockerfile, added a new parameter "-parfile" with value "conf/parameters.yaml" to the CMD command in survBot.py.
- In parameters.yaml, made changes to the EMAIL section:
  - Added comments explaining how to specify mail server and credentials.
  - Added auth_type field with value "SSL".
  - Updated port field to 465 for SSL.
  - Updated user and password fields to read from environment variables or docker secrets.
  - Added comments explaining how to specify mail recipients, sender, and blacklists.
  - Moved location of simulate_fail.json to conf/simulate_fail.json for easier Docker integration

Dockerfile

@@ -8,4 +8,4 @@ RUN apt update && apt install -y bind9-host iputils-ping
 
 COPY . .
 
-CMD [ "python", "./survBot.py", "-html", "www" ]
+CMD [ "python", "./survBot.py", "-html", "www", "-parfile", "conf/parameters.yaml" ]