Swap to sphinx for doc build

.gitlab-ci.yml

Doxyfile

b_asic/schedule.py

docs_sphinx/api/core_operations.rst

docs_sphinx/api/graph_component.rst

docs_sphinx/api/index.rst

docs_sphinx/api/operation.rst

docs_sphinx/api/port.rst

docs_sphinx/api/schedule.rst

docs_sphinx/api/signal.rst

docs_sphinx/api/signal_flow_graph.rst

docs_sphinx/api/simulation.rst

docs_sphinx/api/special_operations.rst

docs_sphinx/conf.py

docs_sphinx/index.rst

docs_sphinx/make.bat