Fixed header style in right sidebar for light mode

[MichielDeMey]

Fixes #65 with the addition of not needing an operationId.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0c0d40f

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[MichielDeMey]

The changeset should be included though. 🤔

[rohit-gohri]

Thank you for your contribution! Not sure why it didn't pick up changeset here, it picked it up for the release #114