update github links to official meta-llama org/account

[vhorvath2010]

some links in the readme are to the stale repository url under an old org/account

this pr updates them to the new https://github.com/meta-llama/llama-stack-client-python base url

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[vhorvath2010]

Hi! Not sure why the CLA bot didn't comment on this, but I did accept the agreement

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Meta Open Source project. Thanks!