Chore: replace node-sass with dart-sass (#21019)

* chore: 移除 node-sass 替换为 sass 进行构建

- 更新调用库 gulp-sass 更新为 gulp-dart-sass 以支持 sass
- 更新 scss 使用语法旧语法已被废弃

* chore: add yarn lock

package.json

@@ -102,7 +102,7 @@
     "gulp": "^4.0.0",
     "gulp-autoprefixer": "^6.0.0",
     "gulp-cssmin": "^0.2.0",
-    "gulp-sass": "^4.0.2",
+    "gulp-dart-sass": "^1.0.2",
     "highlight.js": "^9.3.0",
     "html-webpack-plugin": "^3.2.0",
     "json-loader": "^0.5.7",
@@ -121,12 +121,12 @@
     "markdown-it-container": "^2.0.0",
     "mini-css-extract-plugin": "^0.4.1",
     "mocha": "^6.0.2",
-    "node-sass": "^4.11.0",
     "optimize-css-assets-webpack-plugin": "^5.0.1",
     "postcss": "^7.0.14",
     "progress-bar-webpack-plugin": "^1.11.0",
     "rimraf": "^2.5.4",
-    "sass-loader": "^7.1.0",
+    "sass": "^1.34.0",
+    "sass-loader": "^10.1.1",
     "select-version-cli": "^0.0.2",
     "sinon": "^7.2.7",
     "sinon-chai": "^3.3.0",