Create a sample Deployment to document for the devs

[nce]

We want to create a sample/demo project in github and gitlab to demonstrate to our devs what to do.

This repo should include a few k8s manifests exposing a nginx with our documentation. It should automatically get picked up, by all our clusters as some kind of hellworld app.

AC:

• [x] Github Repo is created
• [x] Github Repo is picked up by argocd
• [x] Nginx Demo Deployment is setup
• [x] Nginx index.html links to our doku and is exposed to the internet

[nce]

We've created a new repo: https://github.com/adorsys/ops-k8s-helloworld

The configured application (nginx/index.html) get's picked up by argo: https://helloworld.staging.adorsys.io/ A documentation should be linked in the future.

The Application Change was configured with 7726a14