Update quickstart llm docker in serve/readme; added ts.llm_launcher example

[mreso]

Description

This PR updates the quickstart llm docker deployment to the open ai api and adds an example which only uses ts.llm_launcher

Type of change

Please delete options that are not relevant.

• This change requires a documentation update

Feature/Issue validation/testing

Please describe the Unit or Integration tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced.
Please also list any relevant details for your test configuration.

• Test A
  Logs for Test A

• Test B
  Logs for Test B

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[agunapal]

Awesome!