C++ Client documentations should have instruction to download released package

[leekeiabstraction]

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• I searched in the issues and found nothing similar.

Description

C++ doc currentrly only have instruction to build from source, we should also update it so that there's instruction to pull released C++ binary (using standard C++ convention)

website/docs/user-guide/cpp/installation.md

Willingness to contribute

• I'm willing to submit a PR!