Move plausible tracker embed into vite config

[katjam]

Fixes #458

Description

• elm-pages v3 was sanitising arbitrary injection of scripts https://github.com/dillonkearns/elm-pages/discussions/339
• move plausible script into vite config

_{Huly®: TD-455}

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[katjam]

Resisted moving the font preload at the same time - but we ought to. I'll make a ticket.