Update Vite integration docs with plugin

[onmax]

Updates Vite integration documentation to use the new @nimiq/core/vite plugin.

Changes

• Replace manual Vite configuration with new Nimiq plugin
• Move vite-plugin-top-level-await to optional for legacy browser support
• Add browser compatibility information
• Simplify setup instructions

Documentation

• Mentions that modern browsers (Chrome 89+, Firefox 89+, Safari 15+, Edge 89+) support top-level await natively
• Explains when top-level await plugin is needed (ES modules with dynamic WASM imports)
• Provides clear instructions for legacy browser support

Preview

• Vite Integration Docs: https://deploy-preview-157--developer-center.netlify.app/web-client/integrations/vite#nimiq-web-client-vite-integration
• Live Demo (Next.js): https://nimiq-starter-next-js-git-85f03e-maximogarciamartinezs-projects.vercel.app

Related PRs

• Core: Add Vite plugin export core-rs-albatross#3497
• Starter Templates: Add inline Vite plugin for Nimiq integration onmax/nimiq-starter#4

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