Disconnected installation Documentation and notes

# linkerd2 disconnected installation notes

1. Download and install linkerd2, add to PATH
2. get images via `linkerd install` and upload to private registry
3. customize image location in linkerd install output

registry=registry.mydomain.com\/ ; linkerd install | sed 's|image:\ |image:\ '"$registry"'|g' | kubectl apply -f -

4. Internal Load Balancer

If you are following this guide you probably need internal only load balancers. Therefore, if following the emojivoto example
make sure to use the internal annotaion for your cloud. AWS example:

```yaml
apiVersion: v1
kind: Service
metadata:
name: web-svc
annotations:
service.beta.kubernetes.io/aws-load-balancer-internal: 0.0.0.0/0
namespace: emojivoto
spec:
type: LoadBalancer
selector:
app: web-svc
ports:
- name: http
port: 80
targetPort: 80
```

The issue contains notes for a disconnected Linkerd installation, including image uploads, registry customization, and an internal AWS load balancer annotation, but it names no documentation file or entry point. First locate where installation guidance is maintained; done means these steps are incorporated into a clear, maintained guide.

Written by the indexing model from the issue text.