Post-v1.0.0 Documentation Updates

[U8NWXD]

• [ ] Verify that the notebook tutorials still work
• [ ] Document Composer and MetaComposer better
• [ ] Document the available arguments for the Engine constructor
• [ ] In processes.rst, document advanced updater techniques (_add, _delete, _move, {'_updater': ...})
• [ ] Document analyses
• [ ] Document Engine.run_for()