Changed small spelling error.

See merge request !3

nginx doesn't start if it fails to resolve a hostname defined as
proxy_pass.
Adding the archiver to the hosts allow to start the server
outside ESS where the archiver is not resolved.
This is for local testing. The archiver won't be accessible without VPN.

Remove manual

The working directory shall be writeable to clone the pv repository.

Allow to install epics-base with caRepeater

Properly stop the server when receiving a SIGTERM

Make it easier to write regex for nginx

Environment variables should be set in the docker-compose.yml file.