get-started: add alias (#23942)

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## Description

Added alias for old path.

## Related issues or tickets

Closes #23919

## Reviews

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- [ ] Editorial review

Signed-off-by: Craig Osterhout <craig.osterhout@docker.com>

Author: craig-osterhout

content/get-started/_index.md

@@ -31,6 +31,7 @@ params:
 aliases:
   - /engine/get-started/
   - /engine/tutorials/usingdocker/
+  - /guides/getting-started/get-docker-desktop/
 ---
 
 If you're new to Docker, this section guides you through the essential resources to get started.