docs: fix VP rc24 styles

[userquin]

Description

This PR includes:

• fix VP styles, css vars changed in rc10 version: missing review of refactor!: remove EnhancedSpy type, deprecate SpyInstance, improve mocks and vi documentation #4400
• adds icons to the home features
• changes markdown theme from vitesse-dark and vitesse-light to github-dark and github-light respectively: fix wcag aa color contrast
• includes experimental allowlist PWA feature to avoid breaking VP layout when requesting missing page: check Dead links cause layout crash vite-pwa/vitepress#22
• removes SPA from Netlify
• includes VP hashmap.json file, required for hydration
• increases the max size asset allowed to be precached, Anthony's svg sponsor file now 2.5MB...

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