docs: bump Gateway API to v1.5.1 and kgateway to v2.3.1

[NomadXD]

Purpose

Update the K3d and on-your-environment installation guides to use Gateway API v1.5.1 and kgateway v2.3.1. Drop the KGW_ENABLE_GATEWAY_API_EXPERIMENTAL_FEATURES flag from the kgateway install since TLSRoute graduated to the standard channel in Gateway API 1.5.

Related Issues

openchoreo/openchoreo#3836

Checklist

• Updated sidebars.ts if adding a new documentation page
• Run npm run start to preview the changes locally
• Run npm run build to ensure the build passes without errors
• Verified all links are working (no broken links)

[coderabbitai]

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Run ID: 5c6f6fdf-bc2a-4a04-abc1-7299bdc7b10c

📥 Commits

Reviewing files that changed from the base of the PR and between b60e45b and 7ea8047.

📒 Files selected for processing (3)

• docs/getting-started/try-it-out/on-k3d-locally.mdx
• docs/getting-started/try-it-out/on-k3d-locally/k3d-prerequisites.sh
• docs/getting-started/try-it-out/on-your-environment.mdx

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 5c6f6fdf-bc2a-4a04-abc1-7299bdc7b10c

📥 Commits

Reviewing files that changed from the base of the PR and between b60e45b and 7ea8047.

📒 Files selected for processing (3)

• docs/getting-started/try-it-out/on-k3d-locally.mdx
• docs/getting-started/try-it-out/on-k3d-locally/k3d-prerequisites.sh
• docs/getting-started/try-it-out/on-your-environment.mdx

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📝 Walkthrough

Summary by CodeRabbit

• Documentation
  • Updated local setup guides to use Gateway API v1.5.1 standard installation instead of the experimental v1.4.1 version.
  • Upgraded kgateway Helm chart to v2.3.1 across all setup documentation.
  • Simplified setup configuration by removing experimental feature environment variable overrides.

Walkthrough

Three getting-started documentation files are updated to install Gateway API CRDs from the v1.5.1 standard manifest (replacing v1.4.1 experimental), upgrade kgateway-crds and kgateway Helm charts to v2.3.1, and drop the KGW_ENABLE_GATEWAY_API_EXPERIMENTAL_FEATURES environment variable from all install commands.

Changes

Gateway API and kgateway version upgrades

Layer / File(s)	Summary
Gateway API CRDs: v1.4.1 experimental → v1.5.1 standard docs/getting-started/try-it-out/on-k3d-locally.mdx, docs/getting-started/try-it-out/on-k3d-locally/k3d-prerequisites.sh, docs/getting-started/try-it-out/on-your-environment.mdx	The kubectl apply --server-side URL is updated from the v1.4.1 experimental-install.yaml to the v1.5.1 standard-install.yaml in all three files.
kgateway Helm chart: v2.2.1 → v2.3.1, remove experimental env var docs/getting-started/try-it-out/on-k3d-locally.mdx, docs/getting-started/try-it-out/on-k3d-locally/k3d-prerequisites.sh, docs/getting-started/try-it-out/on-your-environment.mdx	Helm install commands for kgateway-crds and kgateway are pinned to v2.3.1, and the --set controller.extraEnv.KGW_ENABLE_GATEWAY_API_EXPERIMENTAL_FEATURES=true flag is removed from all three files.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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