Add the chapter cover images (#528)

docs/chapter_array_and_linkedlist/index.md

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+# 数组与链表
+
+<div class="center-table" markdown>
+
+![数组与链表](../assets/covers/chapter_array_and_linkedlist.jpg){ width="70%" }
+
+</div>

docs/chapter_backtracking/index.md

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+# 回溯
+
+<div class="center-table" markdown>
+
+![回溯](../assets/covers/chapter_backtracking.jpg){ width="70%" }
+
+</div>

docs/chapter_computational_complexity/index.md

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+# 复杂度分析
+
+<div class="center-table" markdown>
+
+![复杂度分析](../assets/covers/chapter_complexity_analysis.jpg){ width="70%" }
+
+</div>

docs/chapter_data_structure/index.md

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+# 数据结构简介
+
+<div class="center-table" markdown>
+
+![数据结构](../assets/covers/chapter_data_structure.jpg){ width="70%" }
+
+</div>

docs/chapter_graph/index.md

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+# 图
+
+<div class="center-table" markdown>
+
+![图](../assets/covers/chapter_graph.jpg){ width="70%" }
+
+</div>

docs/chapter_hashing/index.md

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+# 散列表
+
+<div class="center-table" markdown>
+
+![散列表](../assets/covers/chapter_hashing.jpg){ width="70%" }
+
+</div>

docs/chapter_heap/index.md

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+# 堆
+
+<div class="center-table" markdown>
+
+![堆](../assets/covers/chapter_heap.jpg){ width="70%" }
+
+</div>

docs/chapter_introduction/index.md

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+# 引言
+
+<div class="center-table" markdown>
+
+![引言](../assets/covers/chapter_introduction.jpg){ width="70%" }
+
+</div>

docs/chapter_preface/index.md

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+# 写在前面
+
+<div class="center-table" markdown>
+
+![写在前面](../assets/covers/chapter_preface.jpg){ width="70%" }
+
+</div>

docs/chapter_searching/index.md

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+# 搜索
+
+<div class="center-table" markdown>
+
+![搜索](../assets/covers/chapter_searching.jpg){ width="70%" }
+
+</div>

docs/chapter_sorting/index.md

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+# 排序
+
+<div class="center-table" markdown>
+
+![排序](../assets/covers/chapter_sorting.jpg){ width="70%" }
+
+</div>

docs/chapter_stack_and_queue/index.md

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+# 栈与队列
+
+<div class="center-table" markdown>
+
+![栈与队列](../assets/covers/chapter_stack_and_queue.jpg){ width="70%" }
+
+</div>

docs/chapter_tree/index.md

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+# 树
+
+<div class="center-table" markdown>
+
+![树](../assets/covers/chapter_tree.jpg){ width="70%" }
+
+</div>