kgo: add KGO 1.5 docs

[pmalek]

Description

Add KGO 1.5 docs

Depends on

• https://github.com/Kong/gateway-operator/issues/1231

Related:

• #8560
• #8576

Closes https://github.com/Kong/gateway-operator/issues/1202

Testing instructions

Preview link:

• https://deploy-preview-8588--kongdocs.netlify.app/gateway-operator/changelog/#150
• https://deploy-preview-8588--kongdocs.netlify.app/gateway-operator/1.5.x/reference/cli-arguments/
• https://deploy-preview-8588--kongdocs.netlify.app/gateway-operator/1.5.x/reference/version-compatibility/

Checklist

• [x] Review label added
• [x] Conditional version tags added, if applicable.

[netlify[bot]]

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[pmalek]

Waiting for #8560 to merge.