chore: it's Vue.js a Javascript framework to build SPAs (#7039)

- Change section text from `Vue` to `Vue.js`
- Ensure TOC item and resources are under JavaScript section

books/free-programming-books-et.md

@@ -6,7 +6,7 @@
 * [Java](#java)
 * [JavaScript](#javascript)
     * [AngularJS](#angularjs)
-    * [Vue](#vue)
+    * [Vue.js](#vuejs)
 * [PHP](#php)
 * [Python](#python)
 * [R](#r)
@@ -45,7 +45,7 @@
 * [AngularJS raamistiku õppematerjal](https://www.cs.tlu.ee/teemad/get_file.php?id=400) - Sander Leetus (PDF)
 
 
-#### Vue
+#### Vue.js
 
 * [Vue.js raamistiku õppematerjal](https://www.cs.tlu.ee/teemaderegister/get_file.php?id=715) - Fred Korts (PDF)