Clean up home directory

modules/home-manager/common.nix

@@ -5,4 +5,27 @@
     ./shell
     ./git.nix
   ];
+
+  home.sessionVariables = {
+    CARGO_HOME = "${config.xdg.dataHome}/cargo";
+    RUSTUP_HOME = "${config.xdg.dataHome}/rustup";
+    NUGET_PACKAGES = "${config.xdg.dataHome}/nuget";
+    W3M_DIR = "${config.xdg.dataHome}/w3m";
+  };
+
+  xdg.userDirs = {
+    enable = true;
+    createDirectories = true;
+
+    download = "${config.home.homeDirectory}/download";
+
+    music = "${config.home.homeDirectory}/media/music";
+    pictures = "${config.home.homeDirectory}/media/images";
+    videos = "${config.home.homeDirectory}/media/videos";
+
+    desktop = "${config.xdg.dataHome}/desktop";
+    documents = "${config.xdg.dataHome}/documents";
+    publicShare = "${config.xdg.dataHome}/public";
+    templates = "${config.xdg.dataHome}/templates";
+  };
 }