Add installation title and removes npm links

Author: rvsia

packages/react-renderer-demo/src/app/pages/renderer/installation.md

@@ -1,13 +1,9 @@
+### Installation
+
 ```console
 npm install --save @data-driven-forms/react-form-renderer
 ```
 or
 ```console
 yarn add @data-driven-forms/react-form-renderer
-```
-- 
-### Links to NPM
-- a) [React form renderer](https://www.npmjs.com/package/@data-driven-forms/react-form-renderer)
-- b) [Patternfly 3 mapper](https://www.npmjs.com/package/@data-driven-forms/pf3-component-mapper)
-- c) [Patternfly 4 mapper](https://www.npmjs.com/package/@data-driven-forms/pf4-component-mapper)
-- d) [MaterialUI mapper](https://www.npmjs.com/package/@data-driven-forms/mui-component-mapper)
+```