docs: add redirects for engine reference pages

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

docs/reference/commandline/cli.md

@@ -2,6 +2,11 @@
 title: "Use the Docker command line"
 description: "Docker's CLI command description and usage"
 keywords: "Docker, Docker documentation, CLI, command line"
+redirect_from:
+  - /engine/reference/commandline/engine/
+  - /engine/reference/commandline/engine_activate/
+  - /engine/reference/commandline/engine_check/
+  - /engine/reference/commandline/engine_update/
 ---
 
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