add Continuations and programs to overview section in arrow core (#2723)

* add continuations and programs to overview

* move effect section to quickstart div

* Update arrow-site/docs/docs/core/README.md

Co-authored-by: Raúl Raja Martínez <raulraja@gmail.com>

Co-authored-by: Raúl Raja Martínez <raulraja@gmail.com>

arrow-site/docs/docs/core/README.md

@@ -38,6 +38,13 @@ boilerplate and enable direct syntax including [monad comprehensions and computa
 #### Quick Start
   - [Gradle Setup]({{ '/core/#Gradle-kotlin' | relative_url }})
   - [Maven Setup]({{ '/core/#Maven' | relative_url }})
+
+#### Effects & Continuations
+  - [Effect]({{ '/apidocs/arrow-core/arrow.core.continuations/-effect/' | relative_url }})
+  - [EffectScope]({{ '/apidocs/arrow-core/arrow.core.continuations/-effect-scope/' | relative_url }})
+  - [EagerEffect]({{ '/apidocs/arrow-core/arrow.core.continuations/-eager-effect/' | relative_url }})
+  - [EagerEffectScope]({{ '/apidocs/arrow-core/arrow.core.continuations/-eager-effect-scope/' | relative_url }})
+
 </div>
 
 <div class="quickstart-coroutines-item" markdown="1">