Remove "Using MANIFEST.in" guide, moved to setuptools docs

Author: jeanas

source/guides/section-build-and-publish.rst

@@ -6,7 +6,6 @@ Building and Publishing
    :titlesonly:
 
    distributing-packages-using-setuptools
-   using-manifest-in
    single-sourcing-package-version
    dropping-older-python-versions
    packaging-binary-extensions