Add new workflow for Turing Navigation bar!

[shravanngoswamii]

Please, add the Turing Navigation bar workflow and fix the link to docs as it's not accessible now!

You can find the necessary information here: https://github.com/TuringLang/turinglang.github.io/tree/main/assets/scripts

name: Add Navbar

on:
  page_build:  # Triggers the workflow on push events to gh-pages branch
  workflow_dispatch:  # Allows manual triggering
  schedule:
    - cron: '0 0 * * 0'  # Runs every week on Sunday at midnight (UTC)

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

          # Define the URL of the navbar to be used
          NAVBAR_URL="https://raw.githubusercontent.com/TuringLang/turinglang.github.io/main/assets/scripts/TuringNavbar.html"

          # Update all HTML files in the current directory (gh-pages root)
          ./insert_navbar.sh . $NAVBAR_URL

          # 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