DOC6296: migrate Featureform documentation

[epps]

Summary

Adds initial Featureform documentation to the Redis docs repo under:

• Redis for AI and search for user-facing SDK workflows
• Redis products for deployment and operations guidance

What changed

• Added new Featureform docs sections under:
  • content/develop/ai/featureform
  • content/operate/featureform
• Linked Featureform from the existing AI and operate landing pages.
• Reworked the new docs to better match existing Redis docs tone and structure.
• Reframed Terraform guidance so the docs do not imply public Terraform modules/scripts are published; AWS Terraform examples are now described as request-only material via the Redis account team.
• Expanded Featureform provider docs to better reflect the current Python API:
  • Snowflake catalog and key-pair auth
  • Databricks Unity Catalog, OAuth M2M, and job-cluster options
  • Redis ACL/TLS example
• Added missing Apache Iceberg dataset coverage and improved transformation examples.

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Note

Low Risk
Low risk documentation-only change that adds new pages and navigation links; main risk is broken or misrouted relref links or TOC/weight ordering issues in the docs build.

Overview
Adds a new Featureform documentation section under Redis for AI and search (content/develop/ai/featureform/) covering the Python SDK workflow (providers, datasets/transformations, features/labels, training sets/feature views, and streaming), plus a quickstart.

Adds a corresponding Featureform Operate section (content/operate/featureform/) focused on Kubernetes deployment guidance (architecture, prerequisites, Helm install, request-only AWS Terraform examples, and post-install verification), and links Featureform from the develop/ai and operate landing pages (including a small formatting fix at the end of develop/ai/_index.md).

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All committers have signed the CLA.

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[kaitlynmichael]

Looks good to me.

[mich-elle-luna]

Please remove the docs changes under /operate for now, leaving only the docs under /develop/ai and also add a preview banner.

[mich-elle-luna]

this was published in a separate PR