[Optional] Publish to azure samples browser

[hemarina]

This repository will be added to awesome-azd site and it is a Microsoft-authored template, we encourage you to publish it to learn.microsoft.com/samples if you are interested.

[v-xuto]

@marlenezw In order to successfully publish it to learn.microsoft.com/samples. Please remove the invalid products llama-index; and delete the file docs/readme.md, because there is an error cannot generate any content of the sample.

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