chore: normalize bash langauge name

Author: meteorlxy

.github/ISSUE_TEMPLATE/bug_report.md

@@ -38,6 +38,6 @@ assignees: ''
 - Browser:
 - Output of `vuepress info`:
 
-```sh
+```bash
 # Paste output of `vuepress info` here
 ```

docs/guide/assets.md

@@ -24,7 +24,7 @@ It would be useful in some cases:
 
 Take our documentation source files as an example, we are putting the logo of VuePress inside the public directory:
 
-```sh
+```bash
 └─ docs
    ├─ .vuepress
    |  └─ public
@@ -77,7 +77,7 @@ Config reference: [base](../reference/config.md#base)
 
 Although it is not a common usage, you can reference images from dependent packages:
 
-```sh
+```bash
 npm install -D package-name
 ```
 

docs/guide/markdown.md

@@ -33,7 +33,7 @@ When using Markdown [link syntax](https://spec.commonmark.org/0.29/#link-referen
 
 Take our documentation source files as an example:
 
-```sh
+```bash
 └─ docs
    ├─ guide
    │  ├─ getting-started.md

docs/reference/cli.md

@@ -4,7 +4,7 @@ VuePress CLI is provided by [@vuepress/cli](https://www.npmjs.com/package/@vuepr
 
 Run `vuepress --help` to get following help messages:
 
-```sh
+```bash
 Usage:
   $ vuepress <command> [options]
 
@@ -27,7 +27,7 @@ Options:
 
 Start a development server to develop your VuePress site locally.
 
-```sh
+```bash
 Usage:
   $ vuepress dev [sourceDir]
 
@@ -54,7 +54,7 @@ Options set by CLI will override those options with the same name in your config
 
 Build your VuePress site to static files, which are ready for [deployment](../guide/deployment.md).
 
-```sh
+```bash
 Usage:
   $ vuepress build [sourceDir]
 

docs/zh/guide/assets.md

@@ -24,7 +24,7 @@
 
 以我们文档的源文件为例，我们把 VuePress 的 Logo 放在了 Public 目录下：
 
-```sh
+```bash
 └─ docs
    ├─ .vuepress
    |  └─ public
@@ -77,7 +77,7 @@
 
 尽管这不是常见用法，但是你可以从依赖包中引用图片：
 
-```sh
+```bash
 npm install -D package-name
 ```
 

docs/zh/guide/markdown.md

@@ -33,7 +33,7 @@ VuePress 会使用 [markdown-it](https://github.com/markdown-it/markdown-it) 来
 
 以我们文档的源文件为例：
 
-```sh
+```bash
 └─ docs
    └─ zh
       ├─ guide

docs/zh/reference/cli.md

@@ -4,7 +4,7 @@ VuePress 命令行接口是由 [@vuepress/cli](https://www.npmjs.com/package/@vu
 
 执行 `vuepress --help` 来获取下列帮助信息：
 
-```sh
+```bash
 Usage:
   $ vuepress <command> [options]
 
@@ -27,7 +27,7 @@ Options:
 
 启动一个开发服务器，在本地开发你的 VuePress 站点。
 
-```sh
+```bash
 Usage:
   $ vuepress dev [sourceDir]
 
@@ -54,7 +54,7 @@ Options:
 
 将你的 VuePress 站点构建成静态文件，以便你进行后续[部署](../guide/deployment.md)。
 
-```sh
+```bash
 Usage:
   $ vuepress build [sourceDir]