Documentation: remove version line from readme docker compose yaml (#3882)

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Co-authored-by: andrew <110792083+beboprocky@users.noreply.github.com>
Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

README.md

@@ -75,7 +75,6 @@ Please note that when using features such as widgets, Homepage can access person
 Using docker compose:
 
 ```yaml
-version: "3.3"
 services:
   homepage:
     image: ghcr.io/gethomepage/homepage:latest