Yudong Jin 666da25a2a Prepare 1.3.0 release (#1838) ...

* Update the contributors list.

* Update the version number.

* Sync zh and zh-hant versions.

* Move epub builder to the utils branch.

* Optimize all figure files using pngquant.

* Update copyright.

* Update Acknowledgements.

* Update buttons in README.

2026-01-02 03:37:38 +08:00

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