* 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.
* Update pythontutor block with the latest code
* Move docs-en to en/docs
* Move mkdocs.yml and README to en folder
* Fix en/mkdocs.yml
* Update the landing page
* Fix the glossary
* Reduce the font size of the code block tabs
* Add Kotlin blocks to en/docs
* Fix the code link in en/.../deque.md
* Fix the EN README link