Update _index.md

[makaylahipke]

Changed roadmap statuses of "Migrate accessibility.digital.gov" and "Spring 2024 Digital.gov Community Summit" to complete: https://federalist-466b7d92-5da1-4208-974f-d61fd4348571.sites.pages.cloud.gov/preview/gsa/digitalgov.gov/mh-roadmap-1/about/

On [About], the statuses of "Migrate the accessibility.digital.gov microsite to Digital.gov as a guide" and "Plan and host the Spring 2024 Digital.gov Community Summit" were updated to [Complete].

Summary

Basic description of work done. Closes [#issue_no].

Preview

[Link to Preview]()

Solution

How To Test

1. First Step
2. Second Step
3. Third Step

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Dev Checklist

• [ ] PR has correct labels
• [ ] A11y testing (voice over testing, meets WCAG, run axe tools)
• [ ] Code is formatted properly

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