Remove legacy documentation link from introduction.md

Author: anoziere

docs/introduction.md

@@ -16,7 +16,7 @@ Thelia is an open source tool for creating e-business websites and managing onli
 
 :::caution
 
-This is the documentaion for Thelia version >= 2.5.0, if you are using a previous version, check the [Legacy documentation](http://thelia.github.io).
+This is the documentaion for Thelia version >= 2.5.0.
 
 :::