build: Use node 16

[Beraliv]

What

1. Use nvmrc in root/blog2
2. Use nvmrc node version in CI
3. Use node version 16

Why

To use same node version

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Name	Status	Preview	Updated
blog2	✅ Ready (Inspect)	Visit Preview	Sep 15, 2022 at 7:40PM (UTC)

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node_modules report 📦

main	current branch
326M	326M