Updated README after cibuildwheel integration [ci skip]

wheels/README.md

@@ -1,7 +1,11 @@
 README
 ------
 
-This directory creates wheels for tagged versions of Pillow.
+[cibuildwheel](https://github.com/pypa/cibuildwheel) is used to build macOS and Linux
+wheels for tagged versions of Pillow.
+
+This directory contains [multibuild](https://github.com/multi-build/multibuild) to
+build dependencies for the wheels, and dependency licenses to be included.
 
 Archives
 --------
@@ -16,8 +20,8 @@ But, the build will look in that repository before downloading from the
 URL, so if there is a library that often fails to download, or you think might
 fail to download, then download it and add it to the Git repository.
 
-See the `pre_build` in `config.sh` and the `fetch_unpack` routine in
-`multibuild/common_utils.sh` for the logic, and the build recipes in
+See `build` in `.github/workflows/wheels-dependencies.sh` and the `fetch_unpack`
+routine in `multibuild/common_utils.sh` for the logic, and the build recipes in
 `multibuild/library_builders.sh` for the filename to give to the downloaded
 archive.
 
@@ -27,5 +31,5 @@ Wheels
 Wheels are
 [GitHub Actions artifacts created for tags, relevant changes or manual builds](https://github.com/python-pillow/Pillow/actions/workflows/wheels.yml).
 
-Windows wheels are not created here. Instead, they are
+Windows wheels are created separately. They are
 [GitHub Actions artifacts created on each run of the Windows workflow](https://github.com/python-pillow/Pillow/actions/workflows/test-windows.yml?query=branch%3Amain).