New blog feedback

[joshmoore]

see: #1

• Big 🎉 for @MSanKeys963 getting the new blog setup!
• Now available at https://zarr.dev/blog/
• here
  • Use the same header (logo + "chunked, compressed, N-dimensional arrays"
  • Add a link back to https://zarr.dev
  • Add link for creating a new entry
• in zarr-developers.github.io
  • Redirect old posts in https://zarr.dev to the new location
  • add blog/ sidebar link

(I'll close zarr-developers/zarr-developers.github.io#34 which was an alternative proposal that would keep the blog in the same repo. The benefit of this solution is that we can be very inclusive with the permissions on the blog repo to encourage as much uptake as possible. ❤️)