chore: remove winget (#485)

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#### What this PR does / why we need it

Related to
open-component-model/ocm-project#499

#### Which issue(s) this PR fixes
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Usage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.
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Signed-off-by: Gergely Brautigam <[email protected]>

Author: Skarlso

content/docs/getting-started/installation.md

@@ -113,11 +113,8 @@ see: [chocolatey community package: ocm-cli](https://community.chocolatey.org/pa
 
 ### using winget
 
-```powershell
-winget install ocm-cli
-```
-
-see: [microsoft/winget-pkgs: Open-Component-Model](https://github.com/microsoft/winget-pkgs/tree/master/manifests/o/Open-Component-Model)
+_Deprecated_: Please note, winget packages are no longer provided. Any existing packages are still working, but no new
+packages are built and published to winget repository.
 
 ## Building from Source