Remove "recent posts" from main page

The bottom of https://zarr.dev/ lists the old style posts rather than those from https://zarr.dev/blog

These should be disabled:

<img width="1136" alt="Screen Shot 2022-02-21 at 10 30 52" src="https://user-images.githubusercontent.com/88113/154994795-8db1dc06-9b09-4f52-b7bd-9ef762df3c93.png">
