remove obsolete examples (#838)

<!--Thanks for your contribution. See [CONTRIBUTING](CONTRIBUTING.md)
    for Pulumi's contribution guidelines.

    Help us merge your changes more quickly by adding more details such
    as labels, milestones, and reviewers.-->

### Proposed changes

<!--Give us a brief description of what you've done and what it solves.
-->
Remove the old examples due to:
1. obsolete operator install instructions
2. not ported to v2 api (e.g. must have a service account)
3. walkthrough text is erroneous (e.g. about monitoring the operator pod
vs. the workspace pod)


Note that we had a different set of (simpler, newer) examples in
`operator/examples`. Am moving them to the top-level.

### Related issues (optional)

<!--Refer to related PRs or issues: #1234, or 'Fixes #1234' or 'Closes
#1234'.
Or link to full URLs to issues or pull requests in other GitHub
repositories. -->

README.md

@@ -16,10 +16,7 @@ To learn more about the Pulumi Kubernetes Operator visit the [Pulumi documentati
     - [Using Helm](#using-helm)
     - [Using Pulumi](#using-pulumi)
   - [Create Pulumi Stack Resources](#create-pulumi-stack-resources)
-    - [Using kubectl](#using-kubectl)
-    - [Using Pulumi](#using-pulumi-1)
-    - [Simple Examples](#simple-examples)
-    - [Extended Examples](#extended-examples)
+    - [Examples](#examples)
   - [Stack CR Documentation](#stack-cr-documentation)
   - [Prometheus Metrics Integration](#prometheus-metrics-integration)
   - [Development](#development)
@@ -72,39 +69,18 @@ be stored into a Kubernetes Secret. For example, here's now to create a secret f
 kubectl create secret generic -n default pulumi-api-secret --from-literal=accessToken=$PULUMI_ACCESS_TOKEN
 ```
 
-### Using kubectl
-
-Check out [Create Pulumi Stacks using `kubectl` ](./docs/create-stacks-using-kubectl.md) for YAML examples.
-
-### Using Pulumi
-
-Check out [Create Pulumi Stacks using Pulumi](./docs/create-stacks-using-pulumi.md) for Typescript, Python, Go, and .NET examples.
-
-### Simple Examples
+### Examples
 
 Working with sources:
 
-- [Git repositories](./operator/examples/git-source)
-- [Flux sources](./operator/examples/flux-source)
-- [Program resources](./operator/examples/program-source)
-- [Custom sources](./operator/examples/custom-source)
+- [Git repositories](./examples/git-source)
+- [Flux sources](./examples/flux-source)
+- [Program resources](./examples/program-source)
+- [Custom sources](./examples/custom-source)
 
 Advanced:
 
-- [Workspace customization](./operator/examples/custom-workspace)
-
-### Extended Examples
-
-- [Managing a Kubernetes Blue/Green Deployment](./examples/blue-green)
-- [AWS S3 Buckets](./examples/aws-s3)
-
-If you'd like to use your own Pulumi Stack, ensure that you have an existing Pulumi program in a git repo,
-and update the CR with:
-  - An existing github `project` and/or `commit`,
-  - A Pulumi `stack` name that exists and will be selected, or a new stack that will be created and selected.
-  - A Kubernetes Secret for your Pulumi API `accessToken`,
-  - A Kubernetes Secret for other sensitive settings like cloud provider credentials, and
-  - Environment variables and stack config as needed.
+- [Workspace customization](./examples/custom-workspace)
 
 ## Stack CR Documentation