* update docs site to leverage astro v0.21
* fix resolutions
* fix docsearch import
* Resolve `@docsearch/react` is a cross-execution-context-friendly way
* chore: update astro version
* fix: remove line highlighting syntax
* fix: braces inside of attr string
* Match current astro version
* Trim leading newline in MainLayout.astro template
* Move card grid styles into Layout
Co-authored-by: Nate Moore <nate@skypack.dev>