fix: remove outdated Future Improvements section regarding embedding model

[pratik-naik003]

Problem

In the Kubeflow Pipelines section of the README.md, there is a "Future Improvements" paragraph suggesting that the embedding model should be extracted into a separate service to avoid installing the heavy sentence-transformers package during every run.

However, in the final Modern Infrastructure & CI/CD section (under Pipeline Optimizations), the README states that the ingestion pipeline was rewritten and the all-mpnet-base-v2 model is now baked directly into a custom Docker image (Dockerfile.pipeline).

This implemented optimization contradicts the older "Future Improvements" suggestion, making it outdated and potentially confusing for readers trying to understand the architectural direction.

Proposed fix

Remove the outdated "Future Improvements" subsection from the "Kubeflow Pipelines" section as the architectural problem has already been solved using a custom Docker image.

Acceptance criteria

• The outdated "Future Improvements" section under "Kubeflow Pipelines" is completely removed from README.md.
• No conflicting architectural goals remain in the documentation regarding the embedding model optimizations.