Update and simplify ChatQnA tutorials

[alexsin368]

• Remove steps to build images: just use docker compose to pull images instead
• Remove outdated steps: some microservices do not need to be validated
• Add NGINX setup and validation of microservice
• Set host_ip to localhost: previously, using the external IP address causes no responses from the curl commands
• Fix grammar and improve wording

[louie-tsai]

@lvliang-intel @letonghan could you help to review the doc PR?

[yinghu5]

The "Expected Output" and "Summary and Next Steps" sections are marked as "TBD". Ensure these sections are completed with relevant content before finalizing the document. Hope we can remove the TBD in this update. thank you!

[alexsin368]

addressed comments from @yinghu5

[yinghu5]

LGTM, thank you!

[Copilot]

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Files not reviewed (1)

• tutorial/ChatQnA/ChatQnA_Guide.rst: Language not supported

[mkbhanda]

@jedwards-habana would you please review

[jedwards-habana]

Most of the suggested changes are grammatical and, while adding to the clarity of the document, are not critical. Otherwise the documents look good.
.
I didn't review the nvidia.md document. My suggested edit may apply to that document as well.

[alexsin368]

addressed all of @jedwards-habana's comments to the Xeon, Gaudi, AIPC, and NVIDIA tutorials

[jedwards-habana]

Suggested changes have been made. LGTM.