docs: add S3 configuration details for evaluation results in README and remote-provider documentation.

[dmaniloff]

Summary by Sourcery

Document S3 storage configuration for evaluation results by introducing environment variables and secret creation instructions

Documentation:

• Add KUBEFLOW_RESULTS_S3_PREFIX and KUBEFLOW_S3_CREDENTIALS_SECRET_NAME entries to the README with example secret creation commands for AWS credentials
• Update remote-provider.adoc to include instructions for configuring S3-based result storage

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR extends the project documentation to support storing evaluation results in S3 by introducing two new environment variables and providing secret creation instructions, with corresponding updates to both the main README and the remote-provider guide.

Flow diagram for S3 credentials secret creation

flowchart TD
  A["User runs 'oc create secret generic' command"] --> B["Kubernetes Secret created with AWS credentials"] --> C["Ragas Evaluation Container uses secret to access S3"]

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File-Level Changes

Change	Details	Files
Add S3 configuration environment variables to README	Introduced KUBEFLOW_RESULTS_S3_PREFIX for result storage location Introduced KUBEFLOW_S3_CREDENTIALS_SECRET_NAME for AWS credentials secret	README.md
Provide AWS secret creation steps	Added example oc create secret generic command Detailed required AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_DEFAULT_REGION literals	README.md
Update remote-provider documentation for S3 support	Documented usage of the new S3 env vars in the remote provider context Aligned remote-provider.adoc configuration section with README changes	docs/modules/ROOT/pages/remote-provider.adoc

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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