[Docs] Update Vizro docs to use Inter Font

[sulphatet]

Description

Based on the discussion here I have made updates to the yaml files used by MkDocs to convert the Roboto font to the Inter font family for vizro-core and vizro-ai.

Screenshot

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[stichbury]

Thank you @sulphatet -- this is awesome! It's a minor change but it's exactly what was needed. Approving 🌟

[Joseph-Perkins]

Brilliant! thank you 😁