[Issue]: The API section is missing from v9 air-gapped docs and returns HTTP 404

### Before you submit

- [x] This issue is about a documentation page, flow, or piece of content.

### Type of issue

Missing information

### What documentation page or section is affected

/docs/api

### What happened?

After following the steps to set up air-gapped documentation from [Offline Documentation - Documentation in air-gapped environments](https://support.elastic.co/knowledge/1369f209), The link to `Elastic APIs` under `../docs/api` returns a 404

These screenshots show `elastic.co` and `air-gapped`

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**Home Page**

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**API**

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The API bundle doesn't seem to be package, or not referenced correctly. This curl for the uri reference doesn't show `"/docs/api"`
```
curl -s http://localhost:3000/docs | grep -oE 'href="[^"]+"' \
| sed -E 's|href="(https?://[^/"]+).*|\1|' | sort | uniq -c | sort -rn
```

### Additional info

_No response_

Start with the air-gapped documentation setup instructions and the /docs/api entry point, then trace how the Elastic APIs bundle is packaged and referenced. Use the provided curl check to confirm the /docs listing includes the API path, and verify that the air-gapped /docs/api link no longer returns HTTP 404.

Written by the indexing model from the issue text.