[Issue]: Remove APIs page from Solutions and use cases: Security

[KOTungseth]

Type of issue

Other

What documentation page is affected

https://www.elastic.co/docs/solutions/security/apis

What happened?

This page is purely reference and belongs in the Security reference section.

Additional info

No response

[shainaraskas]

the IA contained some reference roundup pages so that there were clear connections between instructional and reference content. if this doesn't provide value to users, we can remove it, but because security content is spread across sections we might want to keep it