docs: update installation guide

Author: Ljzd-PRO

README.md

@@ -65,6 +65,10 @@ See [documentation](https://ktoolbox.readthedocs.io/) for more details.
 
 ### Installation
 
+You can use executables from [releases](https://github.com/Ljzd-PRO/KToolBox/releases) page
+
+Manually install:
+
 - Recommend
   ```bash
   pip3 install pipx

README_zh-CN.md

@@ -66,6 +66,10 @@
 
 ### 安装
 
+你可以从 [releases](https://github.com/Ljzd-PRO/KToolBox/releases) 页面下载可执行文件使用
+
+手动安装：
+
 - 推荐
   ```bash
   pip3 install pipx

docs/en/index.md

@@ -53,12 +53,16 @@
 
 ### Installation
 
-=== "Normal"
+You can use executables from [releases](https://github.com/Ljzd-PRO/KToolBox/releases) page
+
+=== "Manually Install - Normal"
+    Recommend to use pipx
     ```bash
-    pip3 install ktoolbox
+    pip3 install pipx
+    pipx install ktoolbox
     ```
 
-=== "For iOS a-Shell"
+=== "Manually Install - For iOS a-Shell"
     ```bash
     pip3 install ktoolbox-pure-py
     ```

docs/zh/index.md

@@ -54,12 +54,16 @@
 
 ### 安装
 
-=== "一般情况"
-    ```bash
-    pip3 install ktoolbox
-    ```
+你可以从 [releases](https://github.com/Ljzd-PRO/KToolBox/releases) 页面下载可执行文件使用
+
+=== "手动安装 - 一般情况"
+   推荐使用 pipx
+   ```bash
+   pip3 install pipx
+   pipx install ktoolbox
+   ```
 
-=== "对于 iOS a-Shell"
+=== "手动安装 - 对于 iOS a-Shell"
     ```bash
     pip3 install ktoolbox-pure-py
     ```