docs: Improve GitHub Actions security for documentation deployment

- Remove pull_request trigger to prevent unauthorized documentation changes
- Remove path filters to ensure all documentation updates deploy
- Only allow deployment from main and docs branches (write access required)
- Simplify workflow conditions by removing unnecessary PR checks

This ensures only contributors with write access can deploy documentation.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: ammario

.github/workflows/docs.yml

@@ -5,15 +5,6 @@ on:
     branches:
       - main
       - docs  # Also deploy from docs branch for testing
-    paths:
-      - 'docs/**'
-      - 'book.toml'
-      - '.github/workflows/docs.yml'
-  pull_request:
-    paths:
-      - 'docs/**'
-      - 'book.toml'
-      - '.github/workflows/docs.yml'
   workflow_dispatch:
 
 permissions:
@@ -41,13 +32,11 @@ jobs:
         run: mdbook build
 
       - name: Upload artifact
-        if: github.event_name != 'pull_request'
         uses: actions/upload-pages-artifact@v3
         with:
           path: ./book
 
   deploy:
-    if: github.event_name != 'pull_request'
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}