[Website]: Create an HTTP connector - inaccurate content

### Before you submit

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

### Type of issue

Inaccurate

### What documentation page or section is affected

https://www.elastic.co/docs/explore-analyze/workflows/steps/external-systems-apps

### What happened?

In this document, it states:

You can also create an HTTP connector from Stack Management → Connectors by selecting the HTTP connector type.

Kibana connectors UI does not currently expose HTTP connector creation. There is no such option in Kibana. This part should be removed or hidden in the document.

### Additional info

Refer this KB https://support.elastic.dev/knowledge/view/8b097cc4