Fix header link sizes

[archiewood]

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| Name | Type | | ----------------------------- | ----- | | @evidence-dev/core-components | Patch | | @evidence-dev/evidence | Patch | | my-evidence-project | Patch | | @evidence-dev/components | Patch | | evidence-test-environment | Patch |

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[archiewood]

Fixes #1896

A better solution might be to always inherit sizing for links

LGTM -- only thing is this edge cases table looks broken enough right now that it'll be hard to know if there's a regression.