Bug fixes and improvements (#1572)

* Sync zh and zh-hant versions.

* Remove the polyfill.io link from mkdocs.yml

* Update contributors' info for code reviewers and en/zh-hant versions reviewers.

* Fix graph.md

* Update avatars for English version reviewers.

* Sync zh and zh-hant versions.

* Fix two_sum_brute_force.png

* Sync zh and zh-hant versions.
Optimize structrue of index.html.

* Format index.html

zh-hant/codes/rust/chapter_sorting/bubble_sort.rs

@@ -4,7 +4,7 @@
  * Author: codingonion (coderonion@gmail.com)
  */
 
-include!("../include/include.rs");
+use hello_algo_rust::include::print_util;
 
 /* 泡沫排序 */
 fn bubble_sort(nums: &mut [i32]) {

zh-hant/codes/rust/chapter_sorting/bucket_sort.rs

@@ -4,7 +4,7 @@
  * Author: night-cruise (2586447362@qq.com)
  */
 
-include!("../include/include.rs");
+use hello_algo_rust::include::print_util;
 
 /* 桶排序 */
 fn bucket_sort(nums: &mut [f64]) {

zh-hant/codes/rust/chapter_sorting/counting_sort.rs

@@ -4,7 +4,7 @@
  * Author: night-cruise (2586447362@qq.com)
  */
 
-include!("../include/include.rs");
+use hello_algo_rust::include::print_util;
 
 /* 計數排序 */
 // 簡單實現，無法用於排序物件

zh-hant/codes/rust/chapter_sorting/heap_sort.rs

@@ -4,7 +4,7 @@
  * Author: night-cruise (2586447362@qq.com)
  */
 
-include!("../include/include.rs");
+use hello_algo_rust::include::print_util;
 
 /* 堆積的長度為 n ，從節點 i 開始，從頂至底堆積化 */
 fn sift_down(nums: &mut [i32], n: usize, mut i: usize) {

zh-hant/codes/rust/chapter_sorting/insertion_sort.rs

@@ -4,7 +4,7 @@
  * Author: xBLACKICEx (xBLACKICEx@outlook.com)
  */
 
-include!("../include/include.rs");
+use hello_algo_rust::include::print_util;
 
 /* 插入排序 */
 fn insertion_sort(nums: &mut [i32]) {

zh-hant/codes/rust/chapter_sorting/radix_sort.rs

@@ -4,7 +4,7 @@
  * Author: night-cruise (2586447362@qq.com)
  */
 
-include!("../include/include.rs");
+use hello_algo_rust::include::print_util;
 
 /* 獲取元素 num 的第 k 位，其中 exp = 10^(k-1) */
 fn digit(num: i32, exp: i32) -> usize {

zh-hant/codes/rust/chapter_sorting/selection_sort.rs

@@ -4,7 +4,7 @@
  * Author: WSL0809 (wslzzy@outlook.com)
  */
 
-include!("../include/include.rs");
+use hello_algo_rust::include::print_util;
 
 /* 選擇排序 */
 fn selection_sort(nums: &mut [i32]) {