docs/index: Remove provider version

- If users copy/paste this without changing anything, they'll be on a super early (and broken) version.

Author: issyl0

docs/index.md

@@ -9,7 +9,6 @@ terraform {
   required_providers {
     improvmx = {
       source  = "issyl0/improvmx"
-      version = "0.1.0"
     }
   }
 }