[Bug]: Root README documentation links 404 after docs/gateway and docs/ai-gateway removal

Please select the area the issue is related to

Gateway

Please select the aspect the issue is related to

Aspect/API (API backends, definitions, contracts, interfaces, OpenAPI), Aspect/Other (Anything else which does not match above categories)

Description

The Documentation section in the root README.md (and the matching lists in docs/README.md and gateway/README.md) still links to docs/gateway/ and docs/ai-gateway/.

Those trees were deleted in f515e8af7 ("Remove unnecessary docs"). The CLI quick start link still works; Gateway, Gateway Quick Start, AI Gateway, AI Gateway LLM Quick Start, and AI Gateway MCP Quick Start all 404.

The live replacements are:

• Gateway docs → gateway/README.md
• Gateway quick start → gateway/distribution/README.md
• AI Gateway LLM quick start → samples/ai-gw-llm-proxy/README.md
• AI Gateway MCP quick start → samples/ai-gw-mcp-claude-desktop/README.md

Steps to Reproduce

1. Open https://github.com/wso2/api-platform/blob/main/README.md
2. Click Gateway Documentation, Gateway Quick Start, AI Gateway Documentation, AI Gateway LLM Quick Start, or AI Gateway MCP Quick Start
3. Observe GitHub 404

Severity Level of the Issue

Severity/Trivial (Cosmetic issues. Can be fixed in future releases)

Environment Details (with versions)

N/A

Update the documentation links in README.md, docs/README.md, and gateway/README.md, using the replacement paths listed in the issue. Start by checking the affected links in those three files, then verify that Gateway, quick-start, and AI Gateway destinations no longer return 404.