Improve repository URL configuration using GitHub Actions context variables

- Replace hardcoded REPO_URL in config.sh with dynamic GitHub variables
- Use GITHUB_SERVER_URL and GITHUB_REPOSITORY context variables in workflow
- Add fallback values for local development compatibility
- Make configuration more portable and maintainable

Author: GitHub Actions

.github/scripts/config.sh

@@ -4,7 +4,8 @@
 
 # Navigation Links
 SHOP_URL="https://uelectronics.com/"
-REPO_URL="https://github.com/UNIT-Electronics-MX/unit_jun_r3_development_board"
+# Use GitHub Actions context variable if available, fallback to hardcoded URL
+REPO_URL="${GITHUB_SERVER_URL:-https://github.com}/${GITHUB_REPOSITORY:-UNIT-Electronics-MX/unit_devlab_i2c_bme688_environmental_4_in_1_sensor}"
 
 # Icons (using Unicode emojis)
 SHOP_ICON="🛒"

.github/workflows/deploy-mdbook.yml

@@ -51,8 +51,13 @@ jobs:
         mdbook-version: '0.4.52'
 
     - name: Build documentation with configurable navbar
+      env:
+        GITHUB_SERVER_URL: ${{ github.server_url }}
+        GITHUB_REPOSITORY: ${{ github.repository }}
       run: |
         echo "Building documentation using modular scripts..."
+        echo "Repository URL will be: ${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}"
+        
         # Load configuration and build with navbar injection
         source .github/scripts/config.sh
         python3 .github/scripts/build_docs.py