Upgrade to HydePHP v2.0

[Copilot]

Site is running Hyde 1.8; Hyde 2.0.0 shipped October 2025 with Vite, Tailwind v4, Laravel 11, and PHP 8.2+ requirement.

Adds UPGRADE_TO_HYDE_V2.md documenting the full upgrade path with a task checklist covering:

• Composer updates: hyde/framework ^2.0, laravel-zero/framework ^11.0, PHP ^8.2
• Frontend tooling migration: Laravel Mix → Vite, Tailwind CSS v3 → v4, CommonJS → ESM
• Config changes: sidebar key restructuring, navigation format, asset API renames, feature enum migration
• Removals: webpack.mix.js, tailwind.config.js, autoprefixer, prettier, npm run prod

Key breaking changes for this repo:

# composer.json
- "php": "^8.1",
- "hyde/framework": "^1.8",
- "laravel-zero/framework": "^10.0"
+ "php": "^8.2",
+ "hyde/framework": "^2.0",
+ "laravel-zero/framework": "^11.0"

References: Release notes · Upgrade guide

[DannyvdSluijs]

Replaced by #16