Hide /blog/ from archives using Netlify redirects

[craigbox]

One angle we can hit the https://istio.io/v1.15/blog/2022/introducing-ambient-mesh/ problem from is having anything that contains https://istio.io/v.*/blog/ or https://istio.io/v.*/news/ redirect to /latest/.

As these sections are append-only, there's no value in having old versions of them visible.

https://docs.netlify.com/edge-functions/api/ should make this possible.