Added Deploying Stands Agents SDK Agents to AWS App Runner

[vamsi619]

Description

Adds a new CDK example demonstrating how to deploy a Strands Agent application to AWS App Runner. This adds to existing deployment examples, with fully managed infrastructure and automatic HTTPS endpoints.

Type of Change

• New content addition

Motivation and Context

This change adds an App Runner deployment option that eliminates infrastructure complexity entirely. Developers can now deploy production-ready agent applications with automatic HTTPS endpoints, scaling, and load balancing without any networking or infrastructure configuration. This lowers the barrier to entry for deploying Strands Agents to AWS and provides a faster path from development to production.

Areas Affected

• [New] docs/examples/cdk/deploy_to_apprunner/ - A new folder with required files to deploy a Strands Agent application to App Runner
• [Updated] docs/example/README.md - Added a link to Deploy to App Runner README.
• [Updated] docs/examples/cdk/deploy_to_ec2/README.md - Mentioned App Runner as an option
• [New] docs/user-guide/deploy/deploy_to_aws_apprunner.md - App Runner Deployment Guide
• [Updated] docs/user-guide/deploy/operating-agents-in-production.md - Mentioned App Runner as an option
• [Updated] docs/user-guide/deploy/deploy_to_aws_lambda.md - Mentioned App Runner as an option
• [Updated] mkdocs.yml - Added a link for App Runner Documentation in the Navigation

Screenshots

Checklist

• I have read the CONTRIBUTING document
• My changes follow the project's documentation style
• I have tested the documentation locally using mkdocs serve
• Links in the documentation are valid and working
• Images/diagrams are properly sized and formatted
• All new and existing tests pass

Additional Notes

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.