Docpack

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**Minor Improvements**

- Use `pathpick <https://github.com/MacHu-GWU/pathpick-project>`_ to replace the old ``find_matching_files`` implementation.

**Miscellaneous**

- Improve document.
- Migrate to `cookiecutter-pywf_open_source <https://github.com/MacHu-GWU/cookiecutter-pywf_open_source>`_ 0.1.1 code structure.

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- First release
- Add the following public APIs:
- ``docpack.api.find_matching_files``
- ``docpack.api.GitHubFile``
- ``docpack.api.GitHubPipeline``
- ``docpack.api.ConfluencePage``
- ``docpack.api.ConfluencePipeline``