Networking (#115)

* Adding networking course for level102

* Adding URL and minor fix

* Fixing mkdocs nav

Co-authored-by: Arun Thiagarajan <athiagarajan@linkedin.com>
Co-authored-by: kalyan <ksomasundaram@linkedin.com>

mkdocs.yml

@@ -87,7 +87,7 @@ nav:
       - Conclusion: level102/containerization_and_orchestration/conclusion.md
   - Networking:
       - Introduction: level102/networking/introduction.md
-      - Security: level102/networking/security.md       - Scale: level102/networking/scale.md
+      - Security: level102/networking/security.md
       - Scale: level102/networking/scale.md
       - RTT: level102/networking/rtt.md
       - Infrastructure Services: level102/networking/infrastructure-features.md