Removed Serverless Timeline file

Author: nastasha-solomon

raw-migrated-files/docs-content/serverless/security-timelines-ui.md

@@ -6,13 +6,6 @@ mapped_urls:
 
 # Timeline [security-timelines-ui]
 
-% What needs to be done: Lift-and-shift
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-% Use migrated content from existing pages that map to this page:
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-% - [x] ./raw-migrated-files/security-docs/security/timelines-ui.md
-% - [ ] ./raw-migrated-files/docs-content/serverless/security-timelines-ui.md 
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 Use Timeline as your workspace for investigations and threat hunting. You can add alerts from multiple indices to a Timeline to facilitate advanced investigations.
 
 You can drag or send fields of interest to a Timeline to create the desired query. For example, you can add fields from tables and histograms on the **Overview**, **Alerts**, **Hosts**, and **Network** pages, as well as from other Timelines. Alternatively, you can add a query directly in Timeline by expanding the [query builder](/solutions/security/investigate/timeline.md#narrow-expand) and clicking **+ Add field**.