Update README.md

Author: balk77

README.md

@@ -1,6 +1,8 @@
 # Button Plus documentation
 
-This site contains unofficial [Button Plus](https://button.plus/) documentation; it uses the [Just the Docs] theme. Go to [https://balk77.github.io/](https://balk77.github.io/) to view it.
+This site contains unofficial [Button Plus](https://button.plus/) documentation; it uses the [Just the Docs](https://just-the-docs.github.io/just-the-docs-template/) theme. 
+
+Go to [https://balk77.github.io/](https://balk77.github.io/) to view this Button Plus documenation.
 
 The landing page of the documentation is [index.md](index.md) in the root of this repo. All other pages are in [docs/](docs/).