feat: Added Elestio as one-click deploy option

[kaiwalyakoparkar]

This PR introduces new one-click deployment option - Elestio

Fixes #1928

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[MarkEWaite]

I strongly prefer that links to public cloud hosting services be offered from the Jenkins download page rather than being offered from the docker repository README file.

The Jenkins download page already includes public cloud hosting instructions for:

• AWS
• Azure
• Google Cloud
• CIVO
• Oracle Cloud
• Bitnami

The improve this page link on the downloads page will take you to the file that needs to be extended.

If we add the public cloud hosting providers to the Docker documentation, we should also add them to the helm chart documentation. I think it is better to place public cloud provider links in the central location rather than spread it into multiple repositories. We could link from the Docker and Helm chart documentation to that location as a way to increase visibility.

[MarkEWaite]

See my earlier comment