Force a standard set of markdown extensions to be enabled for all books
Created by: seanmadsen
There are some markdown extensions that we basically just want to be enabled all the time, even if each book's
mkdocs.yml file doesn't enable them. I think we should force them to be enabled at this point in the code.
It should set the following:
markdown_extensions: - attr_list - admonition - codehilite - toc(permalink=true) - pymdownx.superfences - pymdownx.inlinehilite - pymdownx.tilde - pymdownx.betterem
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