(GH-224) Discourage use of `Script` resource

[michaeltlombardi]

PR Summary

Prior to this change, the documentation for the built-in Script resource made no mention of the drawbacks to using the resource and didn't direct readers to consider implementing their own resource instead.

This change:

• Updates the note for the Script resource in the PSDscResources module to explicitly suggest readers implement a custom resource.
• Adds the same note with the information about the drawbacks of the Script resource to the v1.1 built-in resource documentation.
• Resolves #224
• Fixes AB#187561

PR Checklist

• [x] Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• [x] Summary: This PR's summary describes the scope and intent of the change.
• [x] Contributor's Guide: I have read the contributors guide.
• [x] Style: This PR adheres to the style guide.

[learn-build-service-prod[bot]]

Learn Build status updates of commit 0a1c9be:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-1.1/reference/resources/windows/scriptResource.md	:white_check_mark:Succeeded	View (dsc-1.1)
dsc/docs-conceptual/dsc-2.0/reference/PSDscResources/Resources/Script/Script.md	:white_check_mark:Succeeded	View (dsc-2.0)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod[bot]]

Learn Build status updates of commit 1ec31e8:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-1.1/reference/resources/windows/scriptResource.md	:white_check_mark:Succeeded	View (dsc-1.1)
dsc/docs-conceptual/dsc-2.0/reference/PSDscResources/Resources/Script/Script.md	:white_check_mark:Succeeded	View (dsc-2.0)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[learn-build-service-prod[bot]]

Learn Build status updates of commit aa01b46:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-1.1/reference/resources/windows/scriptResource.md	:white_check_mark:Succeeded	View (dsc-1.1)
dsc/docs-conceptual/dsc-2.0/reference/PSDscResources/Resources/Script/Script.md	:white_check_mark:Succeeded	View (dsc-2.0)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel