docs: fix missing links for getting started documentation (#2557)

Signed-off-by: Jiacheng Xu <xjcmaxwellcjx@gmail.com>

Author: jiachengxu

docs/getting-started.md

@@ -176,6 +176,7 @@ Follow one of the traffic routing guides to see how Argo Rollouts can leverage a
 provider to achieve more advanced traffic shaping.
 
 * [ALB Guide](getting-started/alb/index.md)
+* [App Mesh Guide](getting-started/appmesh/index.md)
 * [Ambassador Guide](getting-started/ambassador/index.md)
 * [Istio Guide](getting-started/istio/index.md)
 * [Multiple Providers Guide](getting-started/mixed/index.md)

mkdocs.yml

@@ -23,9 +23,11 @@ nav:
   - Basic Usage: getting-started.md
   - Ambassador: getting-started/ambassador/index.md
   - AWS ALB: getting-started/alb/index.md
+  - AWS App Mesh: getting-started/appmesh/index.md
   - Istio: getting-started/istio/index.md
   - NGINX: getting-started/nginx/index.md
   - SMI: getting-started/smi/index.md
+  - Multiple Providers: getting-started/mixed/index.md
 - Dashboard: dashboard.md
 - Rollout:
   - Deployment Strategies: