新增部分海外软件源 & 一些优化

docs/help/index.md

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+---
+hide:
+  - navigation
+---
+
+## 关于报错 Command not found
+
+  - 如果提示 `Command 'curl' not found` 则说明当前未安装 `curl` 软件包
+
+    === "Debian 系 Linux"
+
+        ``` sh
+        apt-get install -y curl
+        ```
+
+        `Debian`   `Ubuntu`   `Kali`
+
+    === "RedHat 系 Linux/openEuler"
+
+        ``` sh
+        yum install -y curl || dnf install -y curl
+        ```
+
+        `Red Hat Enterprise Linux`   `CentOS`   `Rocky Linux`   `Fedora`   `openEuler`
+
+    === "openSUSE"
+
+        ``` sh
+        zypper install curl
+        ```
+
+## 还原已备份的软件源
+
+=== "Debian 系 Linux"
+
+    ``` sh
+    cp -rvf /etc/apt/sources.list.bak /etc/apt/sources.list
+    apt-get update
+    ```
+
+    `Debian`   `Ubuntu`   `Kali`
+
+=== "RedHat 系 Linux/openEuler"
+
+    ``` sh
+    cp -rvf /etc/yum.repos.d.bak /etc/yum.repos.d
+    yum makecache
+    ```
+
+    `Red Hat Enterprise Linux`   `CentOS`   `Rocky Linux`   `Fedora`   `openEuler`
+
+=== "openSUSE"
+
+    ``` sh
+    cp -rvf /etc/zypp/repos.d.bak /etc/zypp/repos.d
+    zypper ref
+    ```
+
+## 其它
+
+  - 如果提示 `bash: /proc/self/fd/11: No such file or directory`，请切换至 `Root` 用户执行，切换命令为 `su root`