Update the Remix template removing the bloat

[remorses]

• update to React 19
• remove eslint
• update to Vite v6
• replace export const links and export const meta with actual meta tags, supported in React 19
• remove entry.client.tsx
• remove entry.server.tsx
• remove StrictMode by default
• update tailwindcss to v4? then you can remove postcss, autoprefixer dependencies
• use package.json imports instead of tsconfig paths
• remove dependencies isbot and vite-tsconfig-paths
• rename @remix/* packages to just remix
• remove remix-serve package, instead bundle the server in the output, using an universal server solution based on fetch