GitBook: [#11] add back to 2.1 link

Author: jonasjabari

docs/README.md

@@ -8,7 +8,7 @@ description: >-
 # Welcome
 
 {% hint style="info" %}
-Version 3.0.0 was released on the xth of February 2022. Click here for more [details](migrate-to-3.0.md)
+Version 3 was released on in February 2022. Click here for more [details](migrate-to-3.0.md)
 
 **Most important changes:**
 
@@ -18,7 +18,7 @@ Version 3.0.0 was released on the xth of February 2022. Click here for more [det
 
 ****
 
-**If you want to see the docs for Version 2.1, click** [**here**](https://docs.matestack.io/matestack-ui-core/v/2.1/)
+You're reading the docs for 3.0 --> If you want to see the docs for Version 2.1, click [here](https://docs.matestack.io/matestack-ui-core/v/2.1/)
 {% endhint %}
 
 ## About

docs/SUMMARY.md

@@ -2,6 +2,7 @@
 
 * [Welcome](README.md)
 * [Migrating to 3.0](migrate-to-3.0.md)
+* [Back to 2.1 (via core)](https://docs.matestack.io/matestack-ui-bootstrap/v/2.1.0)
 
 ## Getting started