* Sync zh and zh-hant versions
* Update the list of contributors.
* Update time_complexity_simple_example.png
* Reduce size of the RGBA images for zh-hant version.
* Sync the zh-hant version of terminology.md
* Prepare 1.2.0 release
* Update the contributors list.
* Revised the figures thoughout the book.
* Utilize roboto and roboto mono as the font faimly of the English edition
* Fix the naming style
* Update two figures.
* Fix margin of the hero image
* Fix margin of the hero image
* Update all the figures
* Update the data structure, sorting, divide and conquer chapters' covers. Add the English edition covers.
* Fix the link of EN translation in README
* Update README.md
* Update README.md
* Update README-en.md