Configuring: add XWayland page

pages/Configuring/XWayland.md

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+XWayland is the bridging mechanism between legacy Xorg programs and Wayland
+compositors.
+
+# HiDPI XWayland
+
+Currently, XWayland on HiDPI screens looks pixelated/blurry, due to Xorg's
+inability to scale.
+There are attempts to add a standard scaling mechanism, such as [MR 733](https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/733).
+
+You can use this MR's wlroots implementation in Hyprland by making a few changes.
+{{< hint >}}
+The following instructions assume you know how to patch programs, either
+manually or using your favourite package manager.
+
+See instructions for [manual patching](https://www.howtogeek.com/415442/how-to-apply-a-patch-to-a-file-and-create-patches-in-linux/)
+and [Pacman patching](https://wiki.archlinux.org/title/Patching_packages).
+{{< /hint >}}
+
+1. Have the latest `xwayland` package patched with at least
+[the HiDPI patch](https://github.com/hyprwm/Hyprland/blob/main/nix/xwayland-hidpi.patch)
+(based on the MR's implementation, but updated).
+
+2. Make sure you have the required Hyprland `wlroots`, patched with
+[the HiDPI xwayland patch](https://gitlab.freedesktop.org/lilydjwg/wlroots/-/commit/6c5ffcd1fee9e44780a6a8792f74ecfbe24a1ca7)
+and [this commit](https://gitlab.freedesktop.org/wlroots/wlroots/-/commit/18595000f3a21502fd60bf213122859cc348f9af)
+**reverted**. This is important, as not reverting it will make opening XWayland
+programs crash Hyprland.
+
+3. Add this line to your configuration:
+    ```toml
+    exec-once=xprop -root -f _XWAYLAND_GLOBAL_OUTPUT_SCALE 32c -set _XWAYLAND_GLOBAL_OUTPUT_SCALE 2
+    ```
+    and configure toolkits to scale using their specific mechanisms, such as
+    ```sh
+    export GDK_SCALE=2
+    export XCURSOR_SIZE=32
+    ```
+
+    {{< hint >}}
+    The GDK_SCALE variable won't conflict with wayland-native GTK programs.
+    {{< /hint >}}
+