split steps for generating the standalone docs and the shared assets

Before this commit, the step to generate the standalone docs (which
included the index page and other HTML files at the root of the
documentation) was bundled with the code copying files needed by
multiple pieces of documentation. This means it wasn't possible to avoid
generating the standalone docs.

This commit splits the step into two, allowing the standalone docs
generation to be excluded while still building the rest of the docs.

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