Bug fixes and improvements (#1298)
* Fix is_empty() implementation in the stack and queue chapter
* Update en/CONTRIBUTING.md
* Remove "剩余" from the state definition of knapsack problem
* Sync zh and zh-hant versions
* Update the stylesheets of code tabs
* Fix quick_sort.rb
* Fix TS code
* Update chapter_paperbook
* Upload the manuscript of 0.1 section
* Fix binary_tree_dfs.rb
* Bug fixes
* Update README
* Update README
* Update README
* Update README.md
* Update README
* Sync zh and zh-hant versions
* Bug fixes
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Yudong Jin