* Add Ruby and Kotlin icons
Add the avatar of @curtishd
* Update README
* Synchronize zh-hant and zh versions.
* Translate the pythontutor blocks to traditional Chinese
* Fix en/mkdocs.yml
* Update the landing page of the en version.
* Fix the Dockerfile
* Refine the en landingpage
* Fix en landing page
* Reset the README.md
* Bug fixes
* Fix the term in heap figures
* Unify the font of the chapter covers for the zh, en, and zh-Hant version
* Sync the zh-hant vertion with the main branch
* Update README for testing
* Update README for testing
* Update README for testing
* Update README for zh, en, zh-hant version
* Fix the issue links
* Update README
* Update README
* edition -> version
* Fix the logo in the en version
* Optimize header color and fix body background color
* Update theme switch's name
* Fix backfrop-filter on Safari
* Update some animation's file name for adding egde when cropping
* Re-count the comments number
* A bug fix in n_queens_problem.md
* 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
Yudong Jin