Fix MIME type console error and enable WebApp production build - #1085

…soft#1085)

### Motivation and Context
<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  2. What problem does it solve?
  3. What scenario does it contribute to?
  4. If it fixes an open issue, please link to the issue here.
-->
This PR fixes the MIME Type error we were seeing in the console and adds
details for running a production build.

Currently, we have the WebApp wrapped in React.StrictMode, which enables
additional development behaviors, including rendering the App.tsx
component twice to find bugs caused by impure rendering. Since
StrictMode is development only, serving a production build of the WebApp
avoids double rendering the app, so wanted to provide it as an option
for developers.

### Description
<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->
MIME type error we were observing: 

![image](https://github.com/microsoft/semantic-kernel/assets/125500434/f529565a-163c-401d-b53e-6be051b27c01)

### Contribution Checklist
<!-- Before submitting this PR, please make sure: -->
- [X] The code builds clean without any errors or warnings
- [X] 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
- [X] I didn't break anyone 😄

…soft#1085)

### Motivation and Context
<!-- Thank you for your contribution to the semantic-kernel repo!
Please help reviewers and future users, providing the following
information:
  1. Why is this change required?
  2. What problem does it solve?
  3. What scenario does it contribute to?
  4. If it fixes an open issue, please link to the issue here.
-->
This PR fixes the MIME Type error we were seeing in the console and adds
details for running a production build.

Currently, we have the WebApp wrapped in React.StrictMode, which enables
additional development behaviors, including rendering the App.tsx
component twice to find bugs caused by impure rendering. Since
StrictMode is development only, serving a production build of the WebApp
avoids double rendering the app, so wanted to provide it as an option
for developers.

### Description
<!-- Describe your changes, the overall approach, the underlying design.
These notes will help understanding how your code works. Thanks! -->
MIME type error we were observing: 

![image](https://github.com/microsoft/semantic-kernel/assets/125500434/f529565a-163c-401d-b53e-6be051b27c01)

### Contribution Checklist
<!-- Before submitting this PR, please make sure: -->
- [X] The code builds clean without any errors or warnings
- [X] 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
- [X] I didn't break anyone 😄