docs: update NOTES.md with AUR packaging steps

Author: ulinja

NOTES.md

@@ -33,3 +33,8 @@ What to do when creating a new release:
 - [ ] push package to pypi: `twine upload dist/hyprpy-<new-version>*`
     - if using API: username `__token__` and password `<API-TOKEN>`
 - [ ] rebuild and redeploy docs if necessary
+- [ ] update AUR package:
+    - bump `pkgver` in `PKGBUILD`
+    - run `updpkgsums` in same dir as `PKGBUILD`
+    - run `makepkg --printsrcinfo > .SRCINFO`
+    - commit and push `PKGBUILD` and `.SRCINFO` to AUR