remove sass related from readme

README.md

@@ -6,7 +6,7 @@ Visit https://amphineko.github.io/amphineko/ for live deployment of `master` bra
 
 Text contents are mainly located at `index.html`. To replace the texts and the picture (`amphineko.png`), can be easily done by editing this file. 
 
-For furthermore modification, including color settings and layouts, check `index.scss` and `stylesheets/*.scss`. Don't forget to run `webpack` to rebuild SASS files and reflect your modification.
+For furthermore modification, including color settings and layouts, check `index.css` and `stylesheets/*.css`. Don't forget to run `webpack` to rebuild files and reflect your modification.
 
 ---
 
@@ -16,7 +16,7 @@ For furthermore modification, including color settings and layouts, check `index
 
 大部分的文本内容储存在 `index.html` 中，修改这个文件即可更改页面的主图片和文本。
 
-若要进行更进一步的修改（如配色方案与页面布局），请编辑 `index.scss` 与 `stylesheets/*.scss`。完事了别忘记 `webpack` 一下来重新编译 SASS 使更改生效。
+若要进行更进一步的修改（如配色方案与页面布局），请编辑 `index.css` 与 `stylesheets/*.css`。完事了别忘记 `webpack` 一下来重新编译使更改生效。
 
 ## build
 
@@ -29,12 +29,6 @@ npm run build
 
 You may check your `NODE_ENV` before executing `npm install .` to ensure `devDependencies` are installed.
 
-`install` might be pretty hard for Windows users who have poor connections to GitHub (for some well-known reasons), while `npm` is trying to fetch `node-sass-binaries` on GitHub.
-
-```
-npm set sass_binary_site https://npm.taobao.org/mirrors/node-sass
-```
-
 ---
 
 运行下面的指令即可完成编译这个仓库。
@@ -46,12 +40,6 @@ npm run build
 
 运行 `npm install .` 前，你也许应该检查一下 `NODE_ENV` 来确保 `devDependencies` 被正确安装。
 
-直接访问 GitHub 有困难的 Windows 用户在 `install` 时，可能会遇到获取 GitHub 上的 `node-sass-binaries` 导致的问题。
-
-```
-npm set sass_binary_site https://npm.taobao.org/mirrors/node-sass
-```
-
 ## known "issue"
 
 The chemical symbol in the name may flash on page load, especially on Chrome.