Update README.md

Author: jonasjabari

docs/start/README.md

@@ -4,11 +4,6 @@ Welcome to the docs of the Ruby gem `matestack-ui-core`, enabling you to easily
 
 The docs cover following main topics:
 
-- Installation and general information
-- UI components in pure Ruby
-- Reactive components in pure Ruby
-- Reactive apps in pure Ruby
-
 
 ## [Installation](/docs/start/100-installation/)
 
@@ -20,8 +15,12 @@ Craft your UI based on your components written in pure Ruby. Utilizing Ruby's am
 
 ## [Reactive components in pure Ruby](/docs/reactive_components/README.md)
 
+**Optional Matestack Feature**
+
 What about going even one step further and implement **REACTIVE** UIs in pure Ruby? Matestack's reactive core components can be used with a simple Ruby DSL enabling you to create reactive UIs without touching JavaScript!
 
 ## [Reactive apps in pure Ruby](/docs/reactive_apps/README.md)
 
+**Optional Matestack Feature**
+
 The last step in order to leverage the full Matestack power: Create app (~Rails layout) and page (Rails ~view) classes and implement dynamic page transitions without any JavaScript implementation required.