* 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
* Update avl_tree.md
* Remove the empty space
* Simplify the heading of the paperbook chapter
* Update hash_map_open_addressing.go to the latest version
* Improvements
* Use Roboto mono as the font of the footers
* Bug fixes
* Add the introduction to the paper book.
* Add the 'new' label to the toc
* Turn off the autoplay
* Polish the intro to paperbook
* Update suggestions.md
* Add announcement of the paper book release
* Fix size of svg
* Update contrib rocks image
* Optimize HTML of the landing page
* Fix the line breaks
