Move CSS related lists under CSS

readme.md

@@ -117,7 +117,10 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [ES6 Tools](https://github.com/addyosmani/es6-tools)
 - [Web Performance Optimization](https://github.com/davidsonfellipe/awesome-wpo)
 - [Web Tools](https://github.com/lvwzhen/tools)
-- [Critical-Path (Above-the-fold) CSS Tools](https://github.com/addyosmani/critical-path-css-tools)
+- [CSS](https://github.com/sotayamashita/awesome-css)
+	- [Critical-Path (Above-the-fold) Tools](https://github.com/addyosmani/critical-path-css-tools)
+	- [Scalability](https://github.com/davidtheclark/scalable-css-reading-list)
+	- [Must-Watch Talks](https://github.com/AllThingsSmitty/must-watch-css)
 - [React](https://github.com/enaqx/awesome-react)
 - [Web Components](https://github.com/mateusortiz/webcomponents-the-right-way)
 - [Polymer](https://github.com/Granze/awesome-polymer)
@@ -133,15 +136,12 @@ Check out my [blog](https://blog.sindresorhus.com) and follow me on [Twitter](ht
 - [Ember](https://github.com/nmec/awesome-ember)
 - [Android UI](https://github.com/wasabeef/awesome-android-ui)
 - [iOS UI](https://github.com/cjwirth/awesome-ios-ui)
-- [Scalable CSS](https://github.com/davidtheclark/scalable-css-reading-list)
 - [Meteor](https://github.com/Urigo/awesome-meteor)
 - [BEM](https://github.com/sturobson/BEM-resources)
-- [CSS Must-Watch Talks](https://github.com/AllThingsSmitty/must-watch-css)
 - [Flexbox](https://github.com/afonsopacifer/awesome-flexbox)
 - [Web Typography](https://github.com/deanhume/typography)
 - [Web Accessibility](https://github.com/brunopulis/awesome-a11y)
 - [Material Design](https://github.com/sachin1092/awesome-material)
-- [CSS](https://github.com/sotayamashita/awesome-css)
 - [D3](https://github.com/wbkd/awesome-d3)
 - [Emails](https://github.com/jonathandion/awesome-emails)
 - [jQuery](https://github.com/peterkokot/awesome-jquery)