docs: removed outdated information about cors configuration

[Frodigo]

Description

Once we remove graphql-request and do not send requests to Magento directly from the front end, we can remove information about CORS configuration from the installation guide.

Motivation and Context

Keep docs up to date

How Has This Been Tested?

I tested docs on my local

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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