Revisit the English version (#1885)

* Update giscus scroller.

* Refine English docs and landing page

* Sync the headings.

* Update landing pages.

* Update the avatar

* Update Acknowledgements

* Update landing pages.

* Update contributors.

* Update

* Fix the formula formatting.

* Fix the glossary.

* Chapter 6. Hashing

* Remove Chinese chars.

* Fix headings.

* Update giscus themes.

* fallback to default giscus theme to solve 429 many requests error.

* Add borders for callouts.

* docs: sync character encoding translations

* Update landing page media layout and i18n

docs/chapter_computational_complexity/space_complexity.md

@@ -806,8 +806,8 @@
 
 $$
 \begin{aligned}
-O(1) < O(\log n) < O(n) < O(n^2) < O(2^n) \newline
-\text{常数阶} < \text{对数阶} < \text{线性阶} < \text{平方阶} < \text{指数阶}
+& O(1) < O(\log n) < O(n) < O(n^2) < O(2^n) \newline
+& \text{常数阶} < \text{对数阶} < \text{线性阶} < \text{平方阶} < \text{指数阶}
 \end{aligned}
 $$
 

docs/chapter_computational_complexity/time_complexity.md

@@ -992,8 +992,8 @@ $$
 
 $$
 \begin{aligned}
-O(1) < O(\log n) < O(n) < O(n \log n) < O(n^2) < O(2^n) < O(n!) \newline
-\text{常数阶} < \text{对数阶} < \text{线性阶} < \text{线性对数阶} < \text{平方阶} < \text{指数阶} < \text{阶乘阶}
+& O(1) < O(\log n) < O(n) < O(n \log n) < O(n^2) < O(2^n) < O(n!) \newline
+& \text{常数阶} < \text{对数阶} < \text{线性阶} < \text{线性对数阶} < \text{平方阶} < \text{指数阶} < \text{阶乘阶}
 \end{aligned}
 $$