fix: update image path

Author: yanglbme

lcci/08.02.Robot in a Grid/README.md

@@ -4,7 +4,7 @@
 <!-- 这里写题目描述 -->
 <p>设想有个机器人坐在一个网格的左上角，网格 r 行 c 列。机器人只能向下或向右移动，但不能走到一些被禁止的网格（有障碍物）。设计一种算法，寻找机器人从左上角移动到右下角的路径。</p>
 
-<p><img src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/10/22/robot_maze.png" style="height: 183px; width: 400px;"></p>
+![](./images/robot_maze.png)
 
 <p>网格中的障碍物和空位置分别用 <code>1</code> 和 <code>0</code> 来表示。</p>
 

lcci/08.02.Robot in a Grid/README_EN.md

@@ -4,19 +4,14 @@
 <p>Imagine a robot sitting on the upper left corner of grid with r rows and c columns. The robot can only move in two directions, right and down, but certain cells are &quot;off limits&quot; such that the robot cannot step on them. Design an algorithm to find a path for the robot from the top left to the bottom right.</p>
 
 
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-<p><img src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/10/22/robot_maze.png" style="height: 183px; width: 400px;" /></p>
-
-
+![](./images/robot_maze.png)
 
 <p>&quot;off limits&quot; and empty grid are represented by&nbsp;<code>1</code> and&nbsp;<code>0</code>&nbsp;respectively.</p>
 
 
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 <p>Return a valid path, consisting of row number and column number of grids in the path.</p>
 
 
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 <p><strong>Example&nbsp;1:</strong></p>