withastro/astro @astrojs/markdown-remark@2.0.0-beta.2 on GitHub

#5785 16107b6a1 Thanks @delucis! - Drop support for legacy Astro-flavored Markdown
#5825 52209ca2a Thanks @bholmesdev! - Baseline the experimental contentCollections flag. You're free to remove this from your astro config!
```
import { defineConfig } from 'astro/config';

export default defineConfig({
- experimental: { contentCollections: true }
})
```
#5806 7572f7402 Thanks @matthewp! - Make astro a peerDependency of integrations
This marks astro as a peerDependency of several packages that are already getting major version bumps. This is so we can more properly track the dependency between them and what version of Astro they are being used with.