feat: Separate preview server from react-email (#2182)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: Kaylee <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Bu Kinoshita <[email protected]>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: 5 people

packages/preview-server/_index.js

@@ -0,0 +1,4 @@
+/**
+ * this file is just a placeholder file so that import.meta.resolve and require.resolve can properly
+ * find out the path to this module. This file does not do anything nor does it need to export anything of value.
+ */