Use of raw directive in README.rst not allowed on PyPI

[matthewfeickert]

Description

In PR #819 the use of the raw directive in rST was used to render images correctly. However, this is not allowed on PyPI and breaks the publication checks. The raw directive must be fixed with image directives like @kratsg originally had. However, this is not rendered correctly on GitHub.

Expected Behavior

Both GitHub and PyPI render the READEM.rst correctly.