Update overview.md

[alexey-romero]

Removing Delve from M365 core services following its retirement

Important

Required for API changes:

• Link to API.md file: ADD LINK HERE
• Link to PR for public-facing schema changes (schema-Prod-beta/v1.0.csdl): ADD LINK HERE

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[learn-build-service-prod]

Learn Build status updates of commit 1b0e428:

✅ Validation status: passed

File	Status	Preview URL	Details
concepts/overview.md	✅Succeeded

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[alexey-romero]

Hi, what's the next step in order to get this PR reviewed?

[learn-build-service-prod]

Learn Build status updates of commit 1b0e428:

✅ Validation status: passed

File	Status	Preview URL	Details
concepts/overview.md	✅Succeeded

For more details, please refer to the build report.