更新前端静态网页获取方式，放弃使用后端获取api

frontend/node_modules/postcss-normalize-timing-functions/README.md

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+# [postcss][postcss]-normalize-timing-functions
+
+> Normalize timing functions with PostCSS.
+
+## Install
+
+With [npm](https://npmjs.org/package/postcss-normalize-timing-functions) do:
+
+```
+npm install postcss-normalize-timing-functions --save
+```
+
+## Example
+
+### Input
+
+```css
+div {
+    animate: fade 3s cubic-bezier(0.42, 0, 1, 1)
+}
+```
+
+### Output
+
+```css
+div {
+    animate: fade 3s ease-in
+}
+``` 
+
+## Usage
+
+See the [PostCSS documentation](https://github.com/postcss/postcss#usage) for
+examples for your environment.
+
+## Contributors
+
+See [CONTRIBUTORS.md](https://github.com/cssnano/cssnano/blob/master/CONTRIBUTORS.md).
+
+## License
+
+MIT © [Ben Briggs](http://beneb.info)
+
+[postcss]: https://github.com/postcss/postcss