feat(nix): move Nix configuration to root level

home/asdf/asdfrc

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+legacy_version_file = yes

home/asdf/default-gems

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+bundler
+erb_lint
+neovim

home/asdf/default-npm-packages

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+browser-sync
+caniuse-cmd
+commitizen
+cz-conventional-changelog
+fast-cli
+json-server
+jsonlint
+lighthouse
+neovim
+pageres-cli
+trash-cli
+unlighthouse
+yarn

home/asdf/default-python-packages

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+autopep8
+black
+codespell
+flake8
+gitlint
+pipenv
+proselint
+neovim-remote
+pyautogui

home/asdf/default.nix

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+{ pkgs, ... }:
+
+{
+  home.file = {
+    ".asdfrc" = { source = ./asdfrc; };
+    ".tool-versions" = { source = ./tool-versions; };
+    ".default-gems" = { source = ./default-gems; };
+    ".default-npm-packages" = { source = ./default-npm-packages; };
+    ".default-python-packages" = { source = ./default-python-packages; };
+    ".asdf/lib".source = "${pkgs.asdf-vm}/share/asdf-vm/lib";
+  };
+
+  home.packages = [ pkgs.asdf-vm ];
+}

home/asdf/tool-versions

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+neovim stable
+nodejs 18.17.1
+ruby 3.2.2
+python 3.9.9 3.10.9
+rust 1.78.0
+deno 1.27.0
+lua 5.1
+golang 1.20
+direnv 2.32.2