Update sm-banners.

[sm1990]

Description

Update the sm-banners of the following pages

Use cases pages.

• https://ballerina.io/usecases/data-oriented-programming/
• https://ballerina.io/usecases/b2b/
• https://ballerina.io/usecases/microservices/

Case studies pages.

• https://ballerina.io/case-studies/wso2/
• https://ballerina.io/case-studies/mosip/

Learn pages

• https://ballerina.io/learn/integration-tutorials/
• https://ballerina.io/learn/by-example/
• https://ballerina.io/learn/ballerina-specifications/

Related website/documentation area

Add/Uncomment the relevant area label out of the following.

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Describe your solution(s)

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