Bug fixes and improvements (#1078)

* Fix the logo in the en version

* Optimize header color and fix body background color

* Update theme switch's name

* Fix backfrop-filter on Safari

* Update some animation's file name for adding egde when cropping

* Re-count the comments number

* A bug fix in n_queens_problem.md

docs/chapter_graph/graph_operations.md

@@ -12,19 +12,19 @@
 - **初始化**：传入 $n$ 个顶点，初始化长度为 $n$ 的顶点列表 `vertices` ，使用 $O(n)$ 时间；初始化 $n \times n$ 大小的邻接矩阵 `adjMat` ，使用 $O(n^2)$ 时间。
 
 === "初始化邻接矩阵"
-    ![邻接矩阵的初始化、增删边、增删顶点](graph_operations.assets/adjacency_matrix_initialization.png)
+    ![邻接矩阵的初始化、增删边、增删顶点](graph_operations.assets/adjacency_matrix_step1_initialization.png)
 
 === "添加边"
-    ![adjacency_matrix_add_edge](graph_operations.assets/adjacency_matrix_add_edge.png)
+    ![adjacency_matrix_add_edge](graph_operations.assets/adjacency_matrix_step2_add_edge.png)
 
 === "删除边"
-    ![adjacency_matrix_remove_edge](graph_operations.assets/adjacency_matrix_remove_edge.png)
+    ![adjacency_matrix_remove_edge](graph_operations.assets/adjacency_matrix_step3_remove_edge.png)
 
 === "添加顶点"
-    ![adjacency_matrix_add_vertex](graph_operations.assets/adjacency_matrix_add_vertex.png)
+    ![adjacency_matrix_add_vertex](graph_operations.assets/adjacency_matrix_step4_add_vertex.png)
 
 === "删除顶点"
-    ![adjacency_matrix_remove_vertex](graph_operations.assets/adjacency_matrix_remove_vertex.png)
+    ![adjacency_matrix_remove_vertex](graph_operations.assets/adjacency_matrix_step5_remove_vertex.png)
 
 以下是基于邻接矩阵表示图的实现代码：
 
@@ -43,19 +43,19 @@
 - **初始化**：在邻接表中创建 $n$ 个顶点和 $2m$ 条边，使用 $O(n + m)$ 时间。
 
 === "初始化邻接表"
-    ![邻接表的初始化、增删边、增删顶点](graph_operations.assets/adjacency_list_initialization.png)
+    ![邻接表的初始化、增删边、增删顶点](graph_operations.assets/adjacency_list_step1_initialization.png)
 
 === "添加边"
-    ![adjacency_list_add_edge](graph_operations.assets/adjacency_list_add_edge.png)
+    ![adjacency_list_add_edge](graph_operations.assets/adjacency_list_step2_add_edge.png)
 
 === "删除边"
-    ![adjacency_list_remove_edge](graph_operations.assets/adjacency_list_remove_edge.png)
+    ![adjacency_list_remove_edge](graph_operations.assets/adjacency_list_step3_remove_edge.png)
 
 === "添加顶点"
-    ![adjacency_list_add_vertex](graph_operations.assets/adjacency_list_add_vertex.png)
+    ![adjacency_list_add_vertex](graph_operations.assets/adjacency_list_step4_add_vertex.png)
 
 === "删除顶点"
-    ![adjacency_list_remove_vertex](graph_operations.assets/adjacency_list_remove_vertex.png)
+    ![adjacency_list_remove_vertex](graph_operations.assets/adjacency_list_step5_remove_vertex.png)
 
 以下是邻接表的代码实现。对比上图，实际代码有以下不同。