docs: add new md file for depolying on kubernetes cluster with kustomize

[tdivoll]

This pull request adds a comprehensive new guide to the documentation for deploying ERDDAP on Kubernetes. The guide covers all major aspects of running ERDDAP in a Kubernetes environment, including persistent storage, deployment configuration, networking, environment management with Kustomize, and dataset XML management. This addition is intended to help administrators set up scalable, production-ready ERDDAP deployments using standard Kubernetes tools and best practices.

Key additions in the new guide:

Kubernetes Deployment Overview:

• Step-by-step instructions for setting up ERDDAP on Kubernetes, including prerequisites, persistent storage with PersistentVolumeClaim, and deployment using the official ERDDAP Docker image.

Configuration and Best Practices:

• Detailed explanation of environment variables (e.g., TZ, TOMCAT_USER_ID, ERDDAP_baseUrl) and volume mounts to ensure correct permissions, logging, and URL routing in a Kubernetes context.
• Tips for managing permissions and avoiding common pitfalls with user/group IDs and shared storage.

Networking and Exposure:

• Example manifests for Kubernetes Service and Ingress resources, including annotations for TLS and routing, to expose ERDDAP securely and reliably.

Environment Management with Kustomize:

• Guidance on structuring configuration files for multiple environments (QA, Production) using Kustomize

[tdivoll]

@ChrisJohnNOAA , closes #74.

I expect Docusaurus to render the :::tip :::, :::info :::, and :::note ::: admonitions when it builds.