Merge branch '20201103_restructure_docs' of github.com:matestack/matestack-ui-core into 20201103_restructure_docs

Author: jonasjabari

docs/start/README.md

@@ -18,8 +18,12 @@ 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 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 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.