Move the toc in README below the preamble for better readability

README.adoc

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 = Base Infrastructure
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 NOTE: This is only *a mirror* from my https://gitea.nehrke.info/nemoinho/base-infra[personal git-server].
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 This project will set up a https://k3s.io/[k3s] Kubernetes cluster on https://www.hetzner.com/cloud[Hetzner Cloud] using OpenTofu and Ansible.
 
 It is meant to set up my base infrastructure for the web.