[Deployment] One-click deployment options in README.md or docs

## Is your feature request related to a problem? Please describe.

oCIS setup has some complexity, but could be much simpler in standardised environments.

## Describe the solution you'd like

Prominent self-hosting buttons to fire up instances on public cloud services could lower the entry barriers.

### Examples

- [`penpot.app`](https://penpot.app/self-host) provides self-hosting options for [`Docker`](https://help.penpot.app/technical-guide/getting-started/#install-with-docker) and [`Elest.io`](https://help.penpot.app/technical-guide/getting-started/#install-with-elestio) (Hetzner, AWS Lightsail, Digital Ocean (High freq. cpu), VULTR (High freq. cpu), LINODE)
- ["Deploy to DigitalOcean" Button](https://docs.digitalocean.com/products/app-platform/how-to/add-deploy-do-button/)
- ["Deploy to Oracle Cloud" Button](https://docs.oracle.com/en-us/iaas/Content/ResourceManager/Tasks/deploybutton.htm) + ([more…](https://medium.com/oracledevs/deploy-a-terraform-configuration-file-with-a-button-click-3b033d8c0f57))
- Bitnami has buttons to launch on Google Cloud Platform, AWS and Azure ([Drupal](https://bitnami.com/stack/drupal/cloud), [Mastodon](https://bitnami.com/stack/mastodon/cloud))
- Probably similar things can be done on OVHcloud and Scaleway…

/cc @hodyroff FYI