Revert sphinx build and deploy to happen on push to main

.github/workflows/sphinx.yml

@@ -4,15 +4,13 @@ on:
   push:
     branches:
       - main
-  pull_request:
-    branches:
-      - main
   workflow_dispatch:
 
 jobs:
   build:
     runs-on: ubuntu-latest
-
+    permissions:
+      contents: write
     steps:
     - uses: actions/checkout@v4
 
@@ -37,13 +35,6 @@ jobs:
       run: |
         sphinx-build -b html docs/source docs/build/html
 
-  deploy:
-    needs: build
-    runs-on: ubuntu-latest
-    if: github.event_name == 'push' || github.event_name == 'workflow_dispatch'
-    permissions:
-      contents: write
-    steps:
     - name: Upload artifacts
       uses: actions/upload-artifact@v4
       with: