Readme update to simplify azd deployment

[paulyuk]

Purpose

This is mostly a readme change to simplify the steps to deploy using AZD and reduce dependencies.

Additionally a small section is added to show how to run the apps locally (with remote AI resources).

Last, a few changes to the AZD bicep files were made to improve least permission grant in RBAC for each resource.

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

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

How to Test

• Follow the readme

What to Check

Verify that the following are valid

• Steps are valid
• App deploys and runs

[paulyuk]

/assign @eamonoreilly

[paulyuk]

Note this issue is getting in the way of clean checks and is independent of this PR:
#10

@eamonoreilly

[paulyuk]

@eamonoreilly note a few issues/discrepancies with app settings made by Bicep vs. what's documented for AZD. Key names for things like CHAT_MODEL_DEPLOYMENT_NAME do not match. Also the value for OpenAiStorageConnection is set to a full connection string secret, and I think we want it instead to be a OpenAiStorageConnection__accountName.

Would like to consult quickly on what we standardize on.

[paulyuk]

All manual tests pass. Readme updated.

Ready to merge. @eamonoreilly