docs: auto-generate Nix module options

docs/nix-options.md

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+---
+title: Nix Module Options
+description: NixOS and Home Manager configuration options for mangowm.
+---
+
+> **Note:** This document is automatically generated from the Nix module source code.
+
+## NixOS
+
+**System-level options via `programs.mango`.**
+
+### `addLoginEntry`
+
+Whether to add a login entry to the display manager for mango. Only has effect if a display manager is configured (e.g. SDDM, GDM via `services.displayManager`).
+
+**Type:** `boolean`
+
+**Default:** `true`
+
+---
+
+### `enable`
+
+Whether to enable mango, a wayland compositor based on dwl.
+
+**Type:** `boolean`
+
+**Default:** `false`
+
+**Example:** `true`
+
+---
+
+### `package`
+
+The mango package to use
+
+**Type:** `package`
+
+**Default:** `<derivation mango-nightly>`
+
+---
+
+## Home Manager
+
+**Configure mangowm declaratively via `wayland.windowManager.mango`.**
+
+### `autostart_sh`
+
+Shell script to run on mango startup. No shebang needed.
+
+When this option is set, the script will be written to
+`~/.config/mango/autostart.sh` and an `exec-once` line
+will be automatically added to the config to execute it.
+
+**Type:** `strings concatenated with "\n"`
+
+**Default:** `""`
+
+**Example:** 
+```nix
+''
+  waybar &
+  dunst &
+''
+```
+
+---
+
+### `bottomPrefixes`
+
+List of prefixes for attributes that should appear at the bottom of the config file.
+Attributes starting with these prefixes will be sorted to the end.
+
+**Type:** `list of string`
+
+**Default:** `[ ]`
+
+**Example:** 
+```nix
+[
+  "source"
+]
+```
+
+---
+
+### `enable`
+
+Whether to enable mangowm, a Wayland compositor based on dwl.
+
+**Type:** `boolean`
+
+**Default:** `false`
+
+---
+
+### `extraConfig`
+
+Extra configuration lines to add to `~/.config/mango/config.conf`.
+This is useful for advanced configurations that don't fit the structured
+settings format, or for options that aren't yet supported by the module.
+
+**Type:** `strings concatenated with "\n"`
+
+**Default:** `""`
+
+**Example:** 
+```nix
+''
+  # Advanced config that doesn't fit structured format
+  special_option = 1
+''
+```
+
+---
+
+### `package`
+
+The mango package to use
+
+**Type:** `package`
+
+**Default:** `<derivation mango-nightly>`
+
+---
+
+### `settings`
+
+Mango configuration written in Nix. Entries with the same key
+should be written as lists. Variables and colors names should be
+quoted. See <https://mangowm.github.io/docs> for more examples.
+
+> **Note:**
+>
+> This option uses a structured format that is converted to Mango's
+> configuration syntax. Nested attributes are flattened with underscore separators.
+> For example: `animation.duration_open = 400` becomes `animation_duration_open = 400`
+> 
+> Keymodes (submaps) are supported via the special `keymode` attribute. Each keymode
+> is a nested attribute set under `keymode` that contains its own bindings.
+
+**Type:** `Mango configuration value`
+
+**Default:** `{ }`
+
+**Example:** 
+```nix
+{
+  # Window effects
+  blur = 1;
+  blur_optimized = 1;
+  blur_params = {
+    radius = 5;
+    num_passes = 2;
+  };
+  border_radius = 6;
+  focused_opacity = 1.0;
+
+  # Animations - use underscores for multi-part keys
+  animations = 1;
+  animation_type_open = "slide";
+  animation_type_close = "slide";
+  animation_duration_open = 400;
+  animation_duration_close = 800;
+
+  # Or use nested attrs (will be flattened with underscores)
+  animation_curve = {
+    open = "0.46,1.0,0.29,1";
+    close = "0.08,0.92,0,1";
+  };
+
+  # Use lists for duplicate keys like bind and tagrule
+  bind = [
+    "SUPER,r,reload_config"
+    "Alt,space,spawn,rofi -show drun"
+    "Alt,Return,spawn,foot"
+    "ALT,R,setkeymode,resize"  # Enter resize mode
+  ];
+
+  tagrule = [
+    "id:1,layout_name:tile"
+    "id:2,layout_name:scroller"
+  ];
+
+  # Keymodes (submaps) for modal keybindings
+  keymode = {
+    resize = {
+      bind = [
+        "NONE,Left,resizewin,-10,0"
+        "NONE,Escape,setkeymode,default"
+      ];
+    };
+  };
+}
+```
+
+---
+
+### `systemd.enable`
+
+Whether to enable `mango-session.target` on
+mango startup. This links to
+`graphical-session.target`.
+Some important environment variables will be imported to systemd
+and dbus user environment before reaching the target, including
+* `DISPLAY`
+* `WAYLAND_DISPLAY`
+* `XDG_CURRENT_DESKTOP`
+* `XDG_SESSION_TYPE`
+* `NIXOS_OZONE_WL`
+You can extend this list using the `systemd.variables` option.
+
+**Type:** `boolean`
+
+**Default:** `true`
+
+**Example:** `false`
+
+---
+
+### `systemd.extraCommands`
+
+Extra commands to run after D-Bus activation.
+
+**Type:** `list of string`
+
+**Default:** 
+```nix
+[
+  "systemctl --user reset-failed"
+  "systemctl --user start mango-session.target"
+]
+```
+
+---
+
+### `systemd.variables`
+
+Environment variables imported into the systemd and D-Bus user environment.
+
+**Type:** `list of string`
+
+**Default:** 
+```nix
+[
+  "DISPLAY"
+  "WAYLAND_DISPLAY"
+  "XDG_CURRENT_DESKTOP"
+  "XDG_SESSION_TYPE"
+  "NIXOS_OZONE_WL"
+  "XCURSOR_THEME"
+  "XCURSOR_SIZE"
+]
+```
+
+**Example:** 
+```nix
+[
+  "--all"
+]
+```
+
+---
+
+### `systemd.xdgAutostart`
+
+Whether to enable autostart of applications using
+`systemd-xdg-autostart-generator(8)`.
+
+**Type:** `boolean`
+
+**Default:** `false`
+
+**Example:** `true`
+
+---
+
+### `topPrefixes`
+
+List of prefixes for attributes that should appear at the top of the config file.
+Attributes starting with these prefixes will be sorted to the beginning.
+
+**Type:** `list of string`
+
+**Default:** `[ ]`
+
+**Example:** 
+```nix
+[
+  "source"
+]
+```
+
+---
+