remove _build folder and update workflow file

Author: haroon10725

.github/workflows/build-and-deploy-documentation.yaml

@@ -0,0 +1,30 @@
+name: Build and Deploy documentation
+
+on:
+  pull_request:
+    types: [closed]
+
+permissions:
+  contents: write
+
+jobs:
+  build-and-deploy:
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+      - name: Install dependencies
+        run: pip install sphinx sphinx_rtd_theme myst_parser
+
+      - name: Build Docs
+        run: |
+          sphinx-build -b html . _build/html
+
+      - name: Deploy to GitHub Pages
+        uses: peaceiris/actions-gh-pages@v7
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          publish_dir: _build/html

.github/workflows/documentation.yaml

@@ -0,0 +1 @@
+_build/