I'd like to only produce a single manual, and the Sphinx docs take too much manual labor to keep up-to-date. Still, there is a lot of useful tools and classes only in Python that need to be exposed in a manual, so this is the quickest way to get there. This flattens the sphinx documentation structure so each component has a <component>_blocks.rst where the actual GNU Radio blocks are managed and a <component>.rst for any other non-block or Python-only code (hier_block2, functions, and classes). The new flattened file structure should make it easier to update, but the index.rst should have some work done to make structure information better.