Add 'old-conf/' from commit '62a64a79a8'

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old-conf/README.md

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+# my nixos/nix-darwin Configs
+
+## Folder structure
+
+- `hosts/`
+  - host specific configuration
+- `nixos-modules/`
+  - nixos modules
+- `hm-imports/`
+  - home-manager modules
+- `data/`
+  - some configuration files, pubkeys, ...
+- `lib/`
+  - helper functions
+- `packages/`
+  - packages to small to put into another repo
+- `secrets/`
+  - agenix secrets
+