chore: port site to tanstack start v1

[birkskyum]

This ports the site from solidstart v1 (vinxi) to tanstack start v1 (vite 8, solid v1) - it's a preparation step for a tanstack start v2 (solid v2) version which will be used for iteration on solid-primitives for solid v2.

• Replaces solid-tippy with it's succesor @floating-ui/dom

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[birkskyum]

@atk , thanks! I've made the adjustments