FastCGI Cache Bust

Added

• Add phpstan and ecs code linting
• Add code-analysis.yaml GitHub action

Changed

• Updated docs to use node 20 & a new sitemap plugin
• PHPstan code cleanup
• ECS code cleanup

Changed

• Don't bust the cache if the element being saved is a draft or revision (#37)
• Updated docs to use Vitepress ^1.0.0-alpha.29
• Added allow-plugins to composer.json to fix CI

Added

• Initial Craft CMS 4 compatibility