Deploy-operator doc update

[damobrisbane]

In https://github.com/observatorium/operator/blob/master/docs/deploy-operator.md, instruction says "create project observatorium", then goes into other projects, before losing context:

....

#### Create Namespaces

```shell
kubectl create namespace observatorium

S3 storage endpoint and secret

For testing purposes you may use minio as described below.

kubectl create namespace observatorium-minio
....

<<< WE ARE NO LONGER IN NS "OBSERVATORIUM >>>

and 2)

RBAC Configuration, step apply service_account.yaml, is namespace default:

....
  name: observatorium-operator
subjects:
- kind: ServiceAccount
  name: observatorium-operator
  namespace: default

So where does the deployment of resources into namespace observatorium" actually start?