Add blog post on kubeadm vs coredns, tidy up TOCs (#266)

docs/index.md

@@ -87,17 +87,17 @@ So if you're familiar enough with the concepts above, and you've done self-hosti
 
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@@ -110,15 +110,15 @@ The best way to support this work is to become a [GitHub Sponsor](https://github
 
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