Redirect "Get Started" to https://learn.microsoft.com/en-us/vcpkg/get_started/overview (#141)

* redirect getting started to the learn site

* applied Roberts feedback

* sync metadata

* don't update vcpkg

* remove en-us

* oops, missing single quote in href

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Co-authored-by: Javier Matos <[email protected]>

Author: JavierMatosD