docs: add pointer to itk

This is an example of a realistic, more complex scikit-build-core SWIG
project that also sparked the origin of scikit-build.

Point to the itk-webassemblyinterface ITK Remote module configuration.
(the main `itk` package has a configured pyproject.toml in the
[ITKPythonPackage](https://github.com/InsightSoftwareConsortium/ITKPythonPackage)
repository which does not support the docs extraction
assumptions).

There are also many additional examples referenced here:

  InsightSoftwareConsortium/ITK#4748

docs/data/projects.toml

@@ -75,3 +75,7 @@ github = "njzjz/nodejs-wheel"
 [[project]]
 pypi = "pygram11"
 github = "douglasdavis/pygram11"
+
+[[project]]
+pypi = "itk-webassemblyinterface"
+github = "InsightSoftwareConsortium/ITK-Wasm"