Simplify header text, link to CNVC

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app.py

@@ -688,10 +688,7 @@ def create_app():
         gr.Markdown("""
         # NVC Deep Practice
 
-        *Learn Nonviolent Communication through embodied practice*
-
-        *Infused with the exquisite warmth of Sarah Peyton and Tara Brach -
-        resonant empathy meeting radical acceptance*
+        *Learn [Nonviolent Communication](https://www.cnvc.org/) through embodied practice*
 
         ---