CI: Remove frontmatter from release notes

npm/release-notes.js

@@ -0,0 +1,9 @@
+const { readFileSync, writeFileSync } = require('node:fs');
+
+const { version } = require('./package.json');
+const versionWithoutPreRelease = version.replace(/-rc\.\d+$/, '');
+
+const markdown = readFileSync(`./docs/src/content/docs/changelog/v${versionWithoutPreRelease}.md`, 'utf8');
+const markdownWithoutFrontmatter = markdown.replace(/---\n.*?\n---\n+/s, '');
+
+writeFileSync('./release-notes.md', markdownWithoutFrontmatter);