Purpose

This pull request updates the references to Azure Form Recognizer to Azure AI Document Intelligence.
It also includes changes to the deployment process to support low-cost deployment using services with free tiers.
The documentation has been updated to provide a step-by-step guide for deploying with minimal costs.
Additionally, a video link has been added to showcase the low-cost deployment process.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

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

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]

Follow the low-cost deploy document instructions.