chore: remove docs deployment workflow

Docs now handled by core-php at core.help

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

.github/workflows/docs.yml

@@ -1,21 +0,0 @@
-name: Deploy Documentation
-
-on:
-  push:
-    branches:
-      - main
-      - dev
-
-permissions:
-  contents: write
-
-jobs:
-  deploy:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
-        with:
-          python-version: 3.x
-      - run: pip install mkdocs-material
-      - run: mkdocs gh-deploy --force