Move bake-book style css to the book output directory
Move bake-book style css to the book output directory

The `bake-book` command includes a link to
`./styles/output/<style-name>.css` but when it got to the `build-pdf`
command, it doesn't have access to the styles directory, we need to the
file to be in the book output directory for it to work.

Connexions/cte,Connexions/cnx-recipes,Connexions/cnx-rulesets,Connexions/cnx-recipes,Connexions/cte,Connexions/cnx-recipes,Connexions/cnx-rulesets,Connexions/cnx-rulesets,Connexions/cnx-rulesets,Connexions/cnx-recipes,Connexions/cnx-recipes