Add search engine with Meilisearch

Since the site keeps growing and growing, especially with Toolkit Kits recipes, I think it could be a nice idea to add a search engine, based on Meilisearch.

To index:
- List of UX packages
- List of UX demos
- List of recipes, per kits, from UX Toolkit

Ref: https://symfony.com/blog/migrating-symfony-com-search-engine-to-meilisearch
