docs: point Arch users to nightcap-git on the AUR

The package is maintained by @dim-ghub.

CHANGELOG.md

@@ -15,6 +15,8 @@ Release notes on GitHub are taken from the matching section here.
   lock and text cursors. Put the file under `content/`, at the path Roblox uses. Thanks to @dim-ghub for the
   idea.
 - `MOCKTAIL_ASSET_TRACE=1` now also prints the files Roblox asks for and does not get, as `[asset] miss`.
+- Arch Linux: `nightcap-git` is on the AUR and builds the current `main` branch. Thanks to @dim-ghub, who
+  maintains it.
 
 ## [0.3.4] - 2026-10-11
 

README.md

@@ -84,8 +84,17 @@ sudo pacman -U nightcap-<version>-1-x86_64.pkg.tar.zst
 ```
 
 They install `/usr/bin/mocktail`, so they conflict with upstream's `mocktail`
-package. Nightcap is not in any distribution repository or the AUR; the
-recipes under `packaging/aur` are kept for local builds only.
+package.
+
+On Arch Linux, [`nightcap-git`](https://aur.archlinux.org/packages/nightcap-git)
+is on the AUR. It builds the current `main` branch and is maintained by
+[@dim-ghub](https://github.com/dim-ghub):
+
+```bash
+yay -S nightcap-git
+```
+
+Nightcap is in no other distribution repository.
 
 Or build and install from source using the steps under
 [Building](#building).