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**Documentation**
- The documentation engine has been changed from MkDocs to Sphinx
- Add dpeeg usage tutorial
- Improve API reference documentation
- Design dpeeg logo
**Project maintenance**
- Designed new :ref:`eeg_data` class to define all EEG data types
- Restructured the way to obtain the dataset, and further defined the basic the
basic dataset and local file dataset. For details, refer to :ref:`eeg_dataset`
- According to the newly defined EEG Data, the trainer and corresponding
experimental methods were reconstructed
- Refactored :doc:`./api/transforms` to support both EEG Data and EEG Dataset