Fix breadcrumb margin problem in v8 docs

[hsubox76]

Not sure if we are going to regenerate v8 docs but if so, need to add this override of the default typedoc css to prevent breadcrumbs (e.g. "firebase.database.Database" title at top of page) from bunching together.

[changeset-bot]

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Latest commit: 731f967

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[google-oss-bot]

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Affected Products

No changes between base commit (2d4f797) and head commit (3a8eedf).

Test Logs

• Base (2d4f797): https://github.com/firebase/firebase-js-sdk/actions/runs/1164613100
• Head (3a8eedf): https://github.com/firebase/firebase-js-sdk/actions/runs/1164899810