fix: Ignore all README.rst file under the source directory.

The paths are relative to the source directory so we use a path glob to
ignore all README.rst files under the `oep` directory.

oeps/conf.py

@@ -96,7 +96,7 @@
 # List of patterns, relative to source directory, that match files and
 # directories to ignore when looking for source files.
 # This patterns also effect to html_static_path and html_extra_path
-exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store', 'README.rst']
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store', '**/README.rst']
 
 # The reST default role (used for this markup: `text`) to use for all
 # documents.