Move JS to it's own section

src/SUMMARY.md

@@ -18,11 +18,11 @@
     - [arrays](./dev/ruby/arrays.md)
   - [TypeScript](./dev/ts/main.md)
     - [interfaces](./dev/ts/interfaces.md)
+  - [JavaScript](./dev/js/main.md)
+    - [ES6](./dev/js/es6.md)
   - [Web](./dev/web/main.md)
   - [front](./dev/web/front/main.md)
     - [babel and babel-preset-stage-2](./dev/web/front/babel-preset-stage-2.md)
-    - [js](./dev/web/javascript/main.md)
-      - [ES6 features](./dev/web/javascript/es6.md)
   - [Regex](./dev/regex/main.md)
   - [Tools](./dev/tools/main.md)
     - [Git](./dev/tools/git.md)