Adding dev chat server running instructions

[aevo98765]

It would be really useful as a dev contributor if you could quickly spin a model inference server.

Two approaches could be taken here:

1. ilab cli setup and ilab serve instructions - link to existing documentation here.

2. Docker contained service to expose port 8000 and 8001 just in case users have another server running on 8000.

Acceptance Criteria:

• Update https://github.com/instructlab/ui/blob/main/docs/development.md
• add Dockerfile and config.yaml example.
• Optional - push a instructlab serve container to dockerhub for easy running.

[nerdalert]

Resolved in #45 🎉