MAHOME-1142: Update the Default Preview Image

[brentonkelly1982]

What's Changed

• Updated default-og-image in siteMetadata.

Testing Locally

1. Run yarn install.
2. Confirm that .env file exists with correct credentials, then run source .env.
3. Run npm run start.

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit e532520):

https://ca-it-prod-home-5918--pr249-mahome-1142-update-d-feyt9map.web.app

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