restructure

- users/rin/default.nix -> users/rin.nix
- users/rin/home.nix +-> users/rin.nix
- users/rin/*.nix -> modules/user/*.nix
- users/rin/scripts/ -> scripts/
- hosts/winter/default.nix -> hosts/winter.nix
- hosts/winter/*.nix -> modules/system/*.nix

- modules are dynamically imported as sets for system and user

modules/user/xdg.nix

@@ -0,0 +1,40 @@
+{ config, ... }:
+let
+  genMimes = mimeTypes: builtins.listToAttrs (builtins.map (mimeType: {
+    name = mimeType;
+    value = "brave-browser.desktop";
+  }) mimeTypes);
+
+  mimes = genMimes [
+    "x-scheme-handler/http"
+    "x-scheme-handler/https"
+    "x-scheme-handler/chrome"
+    "text/html"
+    "application/x-extension-htm"
+    "application/x-extension-html"
+    "application/x-extension-shtml"
+    "application/xhtml+xml"
+    "application/x-extension-xhtml"
+    "application/x-extension-xht"
+  ] // {
+    "x-scheme-handler/tg" = "userapp-Kotatogram Desktop-CHJI40.desktop";
+    "image/png" = "feh.desktop";
+    "image/jpeg" = "feh.desktop";
+  };
+in {
+  xdg = {
+    enable = true;
+    mime.enable = true;
+    mimeApps = {
+      enable = true;
+
+      associations.added = mimes;
+      defaultApplications = mimes;
+    };
+  };
+
+  # XXX: might need to be moved
+  xdg.configFile."wgetrc".text = ''
+    hsts-file = ${config.xdg.cacheHome}/wget-hsts
+  '';
+}