chore: remove duplicated images

Author: yanglbme

README.md

@@ -206,13 +206,13 @@ Doocs 技术社区，致力于打造一个内容完整、持续成长的互联
   <tr>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/doocs">
-        <img src="./images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
+        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
         <sub>公众平台</sub>
       </a><br>
     </td>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/yanglbme">
-        <img src="./images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
+        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
         <sub>个人微信</sub>
       </a><br>
     </td>
@@ -221,4 +221,4 @@ Doocs 技术社区，致力于打造一个内容完整、持续成长的互联
 
 关注「**Doocs 开源社区**」公众号，回复 **PDF**，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！
 
-![](./images/pdf.png)
+<img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/pdf.png" style="width: 600px;"><br>

docs/big-data/README.md

@@ -21,13 +21,13 @@
   <tr>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/doocs">
-        <img src="./images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
+        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
         <sub>公众平台</sub>
       </a><br>
     </td>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/yanglbme">
-        <img src="./images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
+        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
         <sub>个人微信</sub>
       </a><br>
     </td>
@@ -36,4 +36,4 @@
 
 关注「**Doocs 开源社区**」公众号，回复 **PDF**，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！
 
-![](./images/pdf.png)
+<img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/pdf.png" style="width: 600px;"><br>

docs/big-data/images/pdf.png

@@ -41,13 +41,13 @@
   <tr>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/doocs">
-        <img src="./images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
+        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
         <sub>公众平台</sub>
       </a><br>
     </td>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/yanglbme">
-        <img src="./images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
+        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
         <sub>个人微信</sub>
       </a><br>
     </td>
@@ -56,4 +56,4 @@
 
 关注「**Doocs 开源社区**」公众号，回复 **PDF**，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！
 
-![](./images/pdf.png)
+<img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/pdf.png" style="width: 600px;"><br>

docs/big-data/images/qrcode-for-doocs.jpg

@@ -20,13 +20,13 @@
   <tr>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/doocs">
-        <img src="./images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
+        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
         <sub>公众平台</sub>
       </a><br>
     </td>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/yanglbme">
-        <img src="./images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
+        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
         <sub>个人微信</sub>
       </a><br>
     </td>
@@ -35,4 +35,4 @@
 
 关注「**Doocs 开源社区**」公众号，回复 **PDF**，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！
 
-![](./images/pdf.png)
+<img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/pdf.png" style="width: 600px;"><br>