Refactored docs structure and added new API doc source files with a new

docs/source/api/ingestion.persistimages.rst

docs/source/api/ingestion.persistmetadata.rst

docs/source/api/ingestion.projectutils.rst

docs/source/api/ingestion.proposalqueries.rst

docs/source/api/ingestion.proposalutils.rst

docs/source/api/ingestion.remotecopy.rst

docs/source/api/ingestion.rst

docs/source/api/mr_books.commands.rst

docs/source/api/mr_books.rst

docs/source/api/mr_clean.commands.rst

docs/source/api/mr_clean.rst

docs/source/api/null.null.rst

docs/source/api/null.rst

docs/source/api/proprietary_setter.project_finders.rst

docs/source/api/proprietary_setter.prop_setter.rst

docs/source/api/proprietary_setter.rst

docs/source/api/pymygdala.commands.rst

docs/source/api/pymygdala.models.rst

docs/source/api/pymygdala.rst

docs/source/api/qa_results.commands.rst