doc: Add updates for helm chart v1.1.0 release

[vlasebian]

Summary

Updates for helm chart v1.1.0 release

Screenshots

Changes

• Write note about global.ingress.serviceAnnotations deprecation
• Update Traefik and Ingress-Nginx configuration example with the new global.services.annotations field
• Add Traefik buffering middleware configuration in example
• Add note about buffering configuration in the Troubleshooting section
• Add note about the retirement of Ingress-Nginx

Notes for Reviewers

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Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Run Locally: Verified that the docs build using make server, posted screenshots, verified external links. Test with HUGO_PARAMS_SEARCH_ENABLED=true if style changes will affect the search bar.
• New Features Marked: Documentation for new features is marked using the new-in-version shortcode, according to the guidelines in CONTRIBUTING.
• Style Guidelines: Documentation obeys style guidelines in CONTRIBUTING.
• Commits: Commit messages follow guidelines in CONTRIBUTING, there are no fixup commits left.

[vlasebian]

I couldn't add the new-in-version tag in the code blocks because it messes up the final render. I placed it as a simple comment.

[mfilipan]

Added a few notes about support boundaries, let me know what you think about it.

[KrishnaIyer]

LGTM. I think it may be useful in the future to add the changelog here as is done with ECS.

[vlasebian]

I will keep this open until the release is public.

[vlasebian]

The 1.1.0 release is out today, I'm merging the docs now.