doc: add links for overrides / tweaks

gui/default.nix

@@ -53,6 +53,7 @@ in with lib; {
       sound.enable = true;
       security.rtkit.enable = true;
 
+      # https://github.com/NixOS/nixpkgs/pull/213593
       nixpkgs.config.permittedInsecurePackages = [
         "electron-18.1.0" # obsidian
       ];

overlays/default.nix

@@ -22,6 +22,36 @@ let
 in {
   nixpkgs.overlays = if isUnstable then [
     tailscale
+
+    # https://github.com/NixOS/nixpkgs/pull/213613
+    (self: super: {
+      tidal-hifi = super.tidal-hifi.overrideAttrs (old: rec {
+        version = "4.4.0";
+
+        src = super.fetchurl {
+          url =
+            "https://github.com/Mastermindzh/tidal-hifi/releases/download/${version}/tidal-hifi_${version}_amd64.deb";
+          sha256 = "sha256-6KlcxBV/zHN+ZnvIu1PcKNeS0u7LqhDqAjbXawT5Vv8=";
+        };
+
+        postFixup = ''
+          makeWrapper $out/opt/tidal-hifi/tidal-hifi $out/bin/tidal-hifi \
+            --prefix LD_LIBRARY_PATH : "${
+              lib.makeLibraryPath old.buildInputs
+            }" \
+            "''${gappsWrapperArgs[@]}"
+          substituteInPlace $out/share/applications/tidal-hifi.desktop \
+            --replace "/opt/tidal-hifi/tidal-hifi" "tidal-hifi"
+
+          for size in 48 64 128 256 512; do
+            mkdir -p $out/share/icons/hicolor/''${size}x''${size}/apps/
+            convert $out/share/icons/hicolor/0x0/apps/tidal-hifi.png \
+              -resize ''${size}x''${size} $out/share/icons/hicolor/''${size}x''${size}/apps/icon.png
+          done
+        '';
+
+      });
+    })
     (self: super: {
       rex = super.rex.overrideAttrs (old: {
         patches = [