Added deployment docs (#228)

* Added deployment docs

* Fix lint

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Co-authored-by: Karl Ludwig Weise <ludwig@ludwigweise.de>

docs/deployment.md

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+# Deploy OpenReception to a single server
+
+This guide will lead you through setting up OpenReception on linux a server of your choice.
+
+> Too complicated? Managed Hosting is available at [open-reception.com](https://open-reception.com).
+
+## Requirements
+
+This setup requires
+
+- shell access to a root server
+- docker with docker compose installed
+- a small server with 2 cores and 2gb of ram should get you started
+
+## Recommendations/ Considerations
+
+- Update your operating system on a regular basis. Use automatic security updates like `unattended-upgrades` for the very short term issues.
+- Encrypt the drive where your database is stored to prevent data theft by just pulling the hard drive. You can use `luks`.
+- Protect access with `fail2ban`, `ufw`, `crowdsec`, proper user permissions and other best-practices.
+- Make regular backups of your database and test them regularly. You can use `restic`.
+- Monitor your server loads and logs over time to detect peak usages (with insufficient ram or cpu power) and malicious activities.
+
+## Setup
+
+1. Use our [production docker-compose example](../docker-compose.prod.yml)
+1. Use our [Caddyfile example](../Caddyfile)
+1. Adjust the settings in these two files above to your needs.
+1. Run `docker-compose up -d` or `docker compose up -d` depending on your docker installation.
+1. Proceed to secure your instance by opening your admin domain in a browser.