refactor: normalize Angular and Angular.js sections/resources (#5525)

* chore: improve angular / angular.js listings

- Wellnaming section
- fix book title, add format, add creators as is seen in file

via EbookFoundation/free-programming-books#4940

* chore: improve angular / angular.js listings

- Wellnaming section
- fix book title, add format, add creators as is seen in file

via EbookFoundation#4940

* chore: improve angular / angular.js listings

- Wellnaming sections (typescript>angular, javascript>angularjs)
- Add free resources to complete listing with at least 2 items, mainly from html.it website.
- fix titles, add format, add creators as is seen in linked files

via EbookFoundation/free-programming-books#4940

* chore: improve angular / angular.js listings

- Move Angular resources from Angular.js to TypeScript
- Add more resources to avoid single sections

via EbookFoundation/free-programming-books#4940

* chore: improve angular / angular.js listings

- Sections (typescript>angular, javascript>angularjs)
- Add free resources to complete listing with at least 2 items.
- fix titles, add format, add creators as is seen in linked files

via EbookFoundation/free-programming-books#4940

* chore: improve angular / angular.js listings

- Move Angular resources to TypeScript
- Well-naming sections
- fix book title, add format, add creators as is seen in files

via EbookFoundation/free-programming-books#4940

* chore: improve angular / angular.js listings

- Move Angular resources from Angular.js to TypeScript
- Add more resources to avoid single sections
- Complete notes, titles, format, authors

via EbookFoundation/free-programming-books#4940

* chore: improve angular / angular.js listings

- Well-naming section
- Complete notes, titles, format, authors

via EbookFoundation/free-programming-books#4940

* chore: improve angular / angular.js listings

- Handle both as anchor. angular and angular.js

via EbookFoundation/free-programming-books#4940

* chore: improve angular / angular.js listings

- Add http://plnkr.co as valid playground for both
- Add https://stackblitz.com as valid playground for both

via EbookFoundation/free-programming-books#4940

* chore: Angular.js > AngularJS and other pitfails

- Use AngularJS as title/name
- Fix some errors with heading levels in Javascript/Typescript section
- Finish to move some resources accoding their content

via EbookFoundation/free-programming-books#4940

* feature: sections crosslinks as blockquotes

* feature: sections crosslinks as blockquotes

Mainly for AngularJS/Angular, Javascript/Typescript,
web, databases listing sections

* chore: revert scoping crosslinks only to Angular

more/free-programming-playgrounds.md

@@ -1,6 +1,5 @@
 ### Index
 
-* [Angular](#angular)
 * [C](#c)
 * [C#](#csharp)
 * [C++](#cpp)
@@ -18,6 +17,7 @@
 * [Ionic](#ionic)
 * [Java](#java)
 * [JavaScript](#javascript)
+  * [AngularJS](#angularjs)
 * [Kotlin](#kotlin)
 * [Kubernetes](#kubernetes)
 * [.Net](#dotnet)
@@ -37,12 +37,7 @@
 * [Svelte](#svelte)
 * [Swift](#swift)
 * [TypeScript](#typescript)
-
-
-### Angular
-
-* [Plunker](http://plnkr.co)
-* [StackBlitz](https://stackblitz.com/fork/angular)
+  * [Angular](#angular)
 
 
 ### <a name="c"></a>C
@@ -147,6 +142,13 @@
 * [SoloLearn](https://code.sololearn.com/web#javascript)
 
 
+#### AngularJS
+
+> :information_source: See also &#8230; [Angular](#angular)
+
+* [StackBlitz](https://stackblitz.com/fork/angularjs)
+
+
 ### Kotlin
 
 * [Kotlin](https://play.kotlinlang.org)
@@ -264,3 +266,11 @@
 
 * [Playground](https://www.typescriptlang.org/play/index.html)
 * [StackBlitz](https://stackblitz.com/fork/typescript)
+
+
+#### Angular
+
+> :information_source: See also &#8230; [AngularJS](#angularjs)
+
+* [Plunker](http://plnkr.co)
+* [StackBlitz](https://stackblitz.com/fork/angular)