Fix GitHub Pages deploy workflow permissions and branch trigger

- Change trigger branch from main to 0.4.0
- Upgrade contents permission from read to write for gh-pages push
- Also trigger on workflow file changes

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/deploy-docs.yml

@@ -2,13 +2,14 @@ name: Deploy Docs to GitHub Pages
 
 on:
   push:
-    branches: [main]
+    branches: [0.4.0, main]
     paths:
       - 'docs/**'
+      - '.github/workflows/deploy-docs.yml'
   workflow_dispatch:
 
 permissions:
-  contents: read
+  contents: write
   pages: write
   id-token: write