style: wrapped section heading has text center

[hetd54]

closes #571

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[github-actions]

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_(e1b17a3)

[ccv-cj]

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Git SHA: fe4bd0c46417946083e2e6bee0ec8d44bf2c6704

Pa11y test status: PASS

{
    "total": 17,
    "passes": 17,
    "errors": 0,
    "results": {
        "http://localhost:3000/": [],
        "http://localhost:3000/about/careers": [],
        "http://localhost:3000/about/grant-and-publication-materials": [],
        "http://localhost:3000/about/help": [],
        "http://localhost:3000/about/us": [],
        "http://localhost:3000/ai/ai-oscar": [],
        "http://localhost:3000/ai/ai-tools": [],
        "http://localhost:3000/mdx-editing-guide": [],
        "http://localhost:3000/services/classroom": [],
        "http://localhost:3000/services/department-support": [],
        "http://localhost:3000/services/file-storage-and-transfer": [],
        "http://localhost:3000/services/oscar": [],
        "http://localhost:3000/services/project-consulting": [],
        "http://localhost:3000/services/rates": [],
        "http://localhost:3000/services/stronghold": [],
        "http://localhost:3000/services/virtual-machine-hosting": [],
        "http://localhost:3000/services/workshops": []
    }
}