refactor: homepage component to createCardExtension

[milliebase]

Summary 📰

Refactored the home page component with createCardExtension from @backstage/plugin-home-react

Details 📚

Refactored the current home page component, removed the old card and instead used the actual createCardExtension from the home plugin. This is needed for the card to align with the customizable home page grid

Checklist ✅

• I have updated the necessary documentation
• I have signed off all my commits as required by DCO
• My build is green

Testing Notes 🔬

N/A

[changeset-bot]

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Latest commit: a8eeab8

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[kurtaking]

Hey @milliebase, the announcements plugins have been migrated to backstage/community-plugins repo. Will you please open a PR there if you still want to contribute these changes.

Here is the workspace.