Create DocsNav.yml (#628)

Added navigation bar workflow.

.github/workflows/DocsNav.yml

@@ -0,0 +1,44 @@
+name: Add Navbar
+
+on:
+  page_build:  # Triggers the workflow on push events to gh-pages branch
+  workflow_dispatch:  # Allows manual triggering
+
+jobs:
+  add-navbar:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout gh-pages
+        uses: actions/checkout@v4
+        with:
+          ref: gh-pages
+          fetch-depth: 0
+
+      - name: Download insert_navbar.sh
+        run: |
+          curl -O https://raw.githubusercontent.com/TuringLang/turinglang.github.io/main/assets/scripts/insert_navbar.sh
+          chmod +x insert_navbar.sh
+
+      - name: Update Navbar
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          git config user.name github-actions[bot]
+          git config user.email github-actions[bot]@users.noreply.github.com
+         
+          # Update all HTML files in the current directory (gh-pages root)
+          ./insert_navbar.sh .
+         
+          # Remove the insert_navbar.sh file
+          rm insert_navbar.sh
+         
+          # Check if there are any changes
+          if [[ -n $(git status -s) ]]; then
+            git add .
+            git commit -m "Added navbar and removed insert_navbar.sh"
+            git push "https://${GITHUB_ACTOR}:${GITHUB_TOKEN}@github.com/${GITHUB_REPOSITORY}.git" gh-pages
+          else
+            echo "No changes to commit"
+          fi