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-charset/README.md

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+# postcss-normalize-charset
+
+Add necessary or remove extra charset with PostCSS
+
+```css
+a{
+  content: "©";
+}
+```
+
+```css
+@charset "utf-8";
+a{
+  content: "©";
+}
+```
+
+## API
+
+### normalizeCharset([options])
+
+#### options
+
+##### add
+
+Type: `boolean`  
+Default: `true`
+
+Pass `false` to stop the module from adding a `@charset` declaration if it was
+missing from the file (and the file contained non-ascii characters).
+
+## 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 © [Bogdan Chadkin](mailto:trysound@yandex.ru)