Copilot chat cleanup - removing Vite and updating README

[teresaqhoang]

Motivation and Context

Removing Vite dependency to simplify toolchain + updating README

Description

We are authenticating with the /common endpoint, and in order to use /common/ endpoint, the application must not be configured with 'Consumer' as the user audience. The userAudience should be configured with 'All' to use /common/ endpoint.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows SK Contribution Guidelines (https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
• The code follows the .NET coding conventions (https://learn.microsoft.com/dotnet/csharp/fundamentals/coding-style/coding-conventions) verified with dotnet format
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[teresaqhoang]

@adrianwyatt waiting on for a feature description for Shannon to update README (but non-blocking, we can update it in a later PR)