Website dependencies upgraded

[AlfonsoUceda]

High-level summary

Build & stack

• Replaces Sprockets/importmaps with Vite for assets.
• Bumps Rails load defaults to 8.0.
• Updates Ruby & gem deps to latest.
• Adds .nvmrc (Node 22.11.0) and updates bin/setup to install npm deps.
• Runs bundle exec vite upgrade.

Styling & UI

• Upgrades Tailwind CSS to v4 (breaking utility/config changes likely for docs snippets).
• Fixes custom list-style and centers LinkedIn footer link.
• Ensures Open Sauce Sans font loads correctly.
• Adjusts Algolia DocSearch button styling.

Content & housekeeping

• Updates public/2.1 files and removes unneeded Rails files.
• Updates copyright year.
• Comments out legacy test lines not present upstream.

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Docs-maintainer notes (impact)

• Local dev now uses Vite: asset paths and build/dev commands change (no sprockets/importmaps). Update contributor docs accordingly.
• Tailwind v4: double-check utility classes used in docs examples/snippets; v4 removed some legacy utilities and changes config structure.
• Verify DocSearch button looks correct on docs pages after deploy.
• Font change (Open Sauce Sans) may slightly affect line-breaks in code or headings—scan key pages.

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