Ignore README.md files

[khalido]

Adding README.md files to post subfolders to store category information.

e.g there is a folder receipes inside posts, the README file there is an overview.

problem

• README.md file is breaking rebuilding the blog as the script is trying to treat it as a post and failing

fix

• ignore all files starting with README

enhancement

• skip failing files and finish the build, logging all broken files somewhere