docs: Update README files with git pull command

Updates the README files to include the `git pull` command for updating the theme if it was installed via `git clone`.

This ensures that users have the latest version of the theme and can benefit from any new features or bug fixes.

README.md

@@ -100,10 +100,11 @@ To update hexo-theme-redefine, you can run the same **npm** command
 $ npm install hexo-theme-redefine@latest
 ```
 
-Another method is by **git clone**
+If you installed the theme by **git clone**, you can update the theme by running the following command
 
 ```sh
-$ git clone https://github.com/EvanNotFound/hexo-theme-redefine.git themes/redefine
+$ cd themes/redefine
+$ git pull
 ```
 
 

README_zh-CN.md

@@ -104,7 +104,8 @@ $ npm install hexo-theme-redefine@latest
 通过 `git` 更新到最新的 `main` 分支：
 
 ```sh
-$ git clone https://github.com/EvanNotFound/hexo-theme-redefine.git themes/redefine
+$ cd themes/redefine
+$ git pull
 ```
 
 

README_zh-TW.md

@@ -105,7 +105,8 @@ $ npm install hexo-theme-redefine@latest
 通過 `git` 更新到最新的 `main` 分支：
 
 ```sh
-$ git clone https://github.com/EvanNotFound/hexo-theme-redefine.git themes/redefine
+$ cd themes/redefine
+$ git pull
 ```