[DOCS][DRAFT] New Threat Intelligence page

[nastasha-solomon]

Description

Addresses https://github.com/elastic/kibana/pull/136479

The new Threat intelligence page will be added to the Explore section of the main nav (old and new). From this page, users can examine threat indicators that have been ingested and add more threat intel feeds.

The following topics and components may need to be doc'd:

• TBD

Acceptance Test Criteria

TBD

Notes

• Figma mocks: https://www.figma.com/file/bsFM3RuqyIBRmx8O3R2GwW/Threat-intel---Add-data-sources?node-id=372%3A138597

[nastasha-solomon]

Updating label to 8.5 because this page will not be released in 8.4.

[nastasha-solomon]

Duplicate