🐛 fix(server): Clean up the supervisord.conf and COPY supervisord.conf to /etc (#22)

## Description

**What(what issue does this code solve/what feature does it add):**
Docker build server fails because `supervisord.conf` is getting copied
to a different directory other than `/etc`
**How(how does it solve it):**

## Required Checklist:

- [ ] I have added any necessary documentation and comments in my code
(where appropriate)
- [ ] I have added tests to make sure my code runs in all contexts

## Further comments

server.Dockerfile

@@ -42,7 +42,7 @@ RUN apt-get update && apt-get install --no-install-recommends -y \
 
 COPY warp /usr/bin/netris/
 RUN chmod +x /usr/bin/netris/warp
-COPY .scripts/entrypoint.sh .scripts/supervisord.conf /etc/netris/
+COPY .scripts/entrypoint.sh .scripts/supervisord.conf /etc/
 RUN chmod 755 /etc/supervisord.conf /etc/entrypoint.sh
 
 USER 1000