Set jekyll theme and update repository readme

README.md

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 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
 
-Repository for Presto Helm charts.
+Repository for official Presto Helm charts.
+
+## Helm charts repository
+Use the following command to add the repository to Helm client configuration:
+```shell
+helm repo add presto https://prestodb.github.io/presto-helm-charts
+```
+List the latest stable versions of available Helm charts with the command:
+```shell
+helm search repo presto
+```
+
+## Contributing
+Presto welcomes contributions from everyone.
+
+Feel free to create an issue with a bug report, feature request or submit a PR.
+
+Check out [development guidelines](https://github.com/prestodb/presto-helm-charts/blob/main/DEVELOPMENT.md) for local development and testing.
+
+## Questions
+Join [PrestoDB on Slack](https://communityinviter.com/apps/prestodb/prestodb) to ask questions to the community.

_config.yml

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+theme: jekyll-theme-cayman
+title: Presto Helm Charts
+description: The official Helm charts repository for Presto

assets/css/style.scss

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+---
+---
+
+@import "{{ site.theme }}";
+
+.page-header {
+  background-image: linear-gradient(90deg, #5d88d6 0%, #32dbfc 100%);
+  padding: 2rem 1rem;
+}