Revert "Add RTL support notice and library deprecation"

This reverts commit 9347681.

Author: amirhhashemi

README.md

@@ -1,7 +1,3 @@
-> [!IMPORTANT]  
-> TipTap now includes [built-in support for RTL content](https://tiptap.dev/docs/examples/basics/text-direction). This library will no longer be maintained, and I encourage everyone to use the built-in feature.
-
-
 This extension automatically detects the direction of a configurable list of nodes and adds `dir="ltr"` or `dir="rtl"` to them.
 
 **Why not `dir="auto"`?**