Update API version and store in variable

[pamelafox]

Purpose

This pull request focuses on adding the Azure OpenAI API version as an environment variable, modifying the Azure deployment files to include this new variable, and updating the OpenAI client in the chat application to use this variable. Additionally, there are minor changes to the README file to enhance the readability and clarity of the instructions.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[X] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• local, up