Add nix stuff

docs/Nix-NixOS/Home Manager/errors-and-stuff.md

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+# Errors and stuff
+
+## Security errors
+
+Home Manager will warn about insecure packages, to bypass one-time you can run this:
+
+```sh
+export NIXPKGS_ALLOW_INSECURE=1
+```
+
+## Could not find suitable profile directory
+
+Run this:
+
+```sh
+nix-env -q
+```
+
+## file 'home-manager/home-manager/home-manager.nix' was not found in the Nix search path
+
+Error:
+
+```txt
+error: file 'home-manager/home-manager/home-manager.nix' was not found in the Nix search path (add it using $NIX_PATH or -I)
+
+       at «none»:0: (source not available)
+```
+
+idk :(
+
+Sometimes restarting fixes it temporarily.

docs/Nix-NixOS/setup.md

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+# NixOS Setup
+
+Coming soon (to theaters!)