[Bug Report] 无法本地构建docs文档。

### VUX version
2.9.4

### OS/Browsers version
windows/Google-chrome 75版本

### Vue version
2.6.10

### Code

```html
F:\code\vux2\docs>node compile
fs.js:646
return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
^

Error: ENOENT: no such file or directory, open 'F:\code\vux2\docs\.F:\code\vux2\docs\en\faq\$t-is-not-defined.md'
at Object.fs.openSync (fs.js:646:18)
at Object.fs.readFileSync (fs.js:551:33)
at faqs.forEach.one (F:\code\vux2\docs\compile.js:167:24)
at Array.forEach ()
at langs.forEach.lang (F:\code\vux2\docs\compile.js:165:8)
at Array.forEach ()
at Object. (F:\code\vux2\docs\compile.js:154:7)
at Module._compile (module.js:652:30)
at Object.Module._extensions..js (module.js:663:10)
at Module.load (module.js:565:32)

```

### Steps to reproduce
yarn
cd docs
node compile

### What is Expected?
能够正确的构建本地文档，

### What is actually happening?
目前构建本地文档报错