Fix the deployment via Helm (#3)

* Fix the deployment via Helm

* Fix CRD

* Fix Clippy warning

* Add configuration for the README file

* Render README file

* Remove unused dependencies

Author: siegfriedweber

.readme/README.md.j2

@@ -0,0 +1,24 @@
+{%- set title="Stackable Operator for OpenSearch" -%}
+{%- set operator_name="opensearch" -%}
+{%- set operator_docs_slug="opensearch" -%}
+{%- set related_reading_links=[] -%}
+
+{% filter trim %}
+  {%- include "partials/borrowed/header.md.j2" -%}
+{% endfilter %}
+
+{% filter trim %}
+  {%- include "partials/borrowed/links.md.j2" -%}
+{% endfilter %}
+
+{% filter trim %}
+  {%- include "partials/main.md.j2" -%}
+{% endfilter %}
+
+{% filter trim %}
+  {%- include "partials/borrowed/footer.md.j2" -%}
+{% endfilter %}
+
+{% filter trim %}
+  {%- include "partials/borrowed/related_reading.md.j2" -%}
+{% endfilter %}

.readme/partials/main.md.j2

@@ -0,0 +1,19 @@
+This is a Kubernetes operator to manage [OpenSearch](https://opensearch.org/) clusters.
+
+{% filter trim %}
+  {%- include "partials/borrowed/overview_blurb.md.j2" -%}
+{% endfilter %}
+
+## Installation
+
+You can install the operator using [stackablectl or helm](https://docs.stackable.tech/home/stable/{{operator_name}}/getting_started/installation).
+
+Read on to get started with it, or see it in action in one of our [demos](https://stackable.tech/en/demos/).
+
+## Getting Started
+
+You can follow this [tutorial](https://docs.stackable.tech/home/stable/{{operator_name}}/getting_started/first_steps).
+
+{% filter trim %}
+  {%- include "partials/borrowed/documentation.md.j2" -%}
+{% endfilter %}