feat: nixos configs & docs

home/i3/default.nix

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+{
+  pkgs,
+  config,
+  ...
+}: {
+  # i3 配置，基于 https://github.com/endeavouros-team/endeavouros-i3wm-setup
+  # 直接从当前文件夹中读取配置文件作为配置内容
+
+  # wallpaper, binary file
+  home.file.".config/i3/wallpaper.jpg".source = ../../wallpaper.jpg;
+  home.file.".config/i3/config".source = ./config;
+  home.file.".config/i3/i3blocks.conf".source = ./i3blocks.conf;
+  home.file.".config/i3/keybindings".source = ./keybindings;
+  home.file.".config/i3/scripts" = {
+    source = ./scripts;
+    # copy the scripts directory recursively
+    recursive = true;
+    executable = true;  # make all scripts executable
+  };
+
+  # 直接以 text 的方式，在 nix 配置文件中硬编码文件内容
+  # home.file.".xxx".text = ''
+  #     xxx
+  # '';
+
+}