Add documentation for setting up insecure registries on a k8s node

[berndtj]

Not all kubernetes installations support a local image repo out of the box. We should add a section to the "advanced" setup docs to address setting up insecure registries.

• [ ] Bug
• [ ] Feature
• [x] Enhancement

Detailed Description

Context

Possible Implementation

Complexity

• [x] Low - Simple enhancement or bug fix, no architectural changes or refactoring
• [ ] Medium - Change requires some thought, but is relatively isolated
• [ ] High - Significant architectural change or large refactor

Impact

• [x] Low - Annoyance, but does not impact business or functionality
• [ ] Medium - Issue can be worked around, but is causing pain
• [ ] High - Blocker

Your Environment

• Dispatch CLI version (or git commit):
• Dispatch Chart version (or image[s] tag):
• Operating System and version:
• Kubernetes version (and distribution):
• Etc (any other useful environmental information):

[imikushin]

Yep, and Docker for Mac is one of those