The latest sphinx and docutils versions currently used on readthedocs
are no longer compatible. Explicitly list the package versions that
should be used when building the documentation.
Add these requirements so that they are installed into the readthedocs
environment before building the documentation. If left to use the
default installation method the build process times out.
Update the documentation and build system for producing documentation for
WA3 with support for automatic building on readthedocs.
Note: This is currently a WIP.