Use folder based metadata more

[BillWagner]

Prefer folder based metadata to file based metadata.

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docs/ai/how-to/app-service-aoai-auth.md	Authenticate to Azure OpenAI from an Azure hosted app using Microsoft Entra ID
docs/ai/how-to/app-service-db-auth.md	[System-assigned](https://review.learn.microsoft.com/en-us/dotnet/ai/how-to/app-service-db-auth?branch=pr-en-us-44706)
docs/ai/how-to/content-filtering.md	"Manage OpenAI Content Filtering in a .NET app"
docs/ai/quickstarts/get-started-openai.md	CustomerIntent: As a .NET developer new to AI, I want deploy and use sample code to interact to learn from the sample code.
docs/ai/quickstarts/quickstart-ai-chat-with-data.md	Build a .NET AI vector search app
docs/ai/quickstarts/quickstart-assistants.md	docs/ai/quickstarts/quickstart-assistants
docs/ai/quickstarts/quickstart-azure-openai-tool.md	CustomerIntent: As a .NET developer new to OpenAI, I want deploy and use sample code to interact to learn from the sample code how to extend the model using Tools.
docs/ai/quickstarts/quickstart-local-ai.md	Quickstart - Connect to and chat with a local AI using .NET
docs/ai/quickstarts/quickstart-openai-generate-images.md	CustomerIntent: As a .NET developer new to OpenAI, I want deploy and use sample code to interact to learn from the sample code to generate images.
docs/ai/quickstarts/quickstart-openai-summarize-text.md	docs/ai/quickstarts/quickstart-openai-summarize-text
docs/azure/sdk/media/mermaidjs/ChainedTokenCredentialAuthFlow.md	docs/azure/sdk/media/mermaidjs/ChainedTokenCredentialAuthFlow
docs/azure/sdk/media/mermaidjs/ChainSequence.md	docs/azure/sdk/media/mermaidjs/ChainSequence
docs/azure/sdk/media/mermaidjs/DefaultAzureCredentialAuthFlow.md	docs/azure/sdk/media/mermaidjs/DefaultAzureCredentialAuthFlow
docs/azure/sdk/media/mermaidjs/DefaultAzureCredentialExcludes.md	docs/azure/sdk/media/mermaidjs/DefaultAzureCredentialExcludes