[docs-only] work on getting started and deployment examples docs

docs/ocis/deployment/preparing_server.md

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+---
+title: "Preparing a server"
+date: 2020-10-12T14:04:00+01:00
+weight: 10
+geekdocRepo: https://github.com/owncloud/ocis
+geekdocEditPath: edit/master/docs/ocis/deployment
+geekdocFilePath: preparing_server.md
+---
+
+{{< toc >}}
+
+
+## Example for Hetzner Cloud
+* create server on Hetzner Cloud. Set labels "owner" and "for". Example for hcloud cli:
+`hcloud server create --type cx21 --image ubuntu-20.04 --ssh-key admin --name ocis-server --label owner=admin --label for=testing` 
+
+* Configure DNS A-records for needed domains pointing on the servers ip address, for example in CloudFlare
+
+* Access server via ssh as root
+
+* Create a new user
+
+  `$ adduser --disabled-password --gecos "" admin`
+
+* Add user to sudo group
+
+  `$ usermod -aG sudo admin`
+
+* Install docker
+
+  ```
+  apt update
+  apt install docker.io
+  ```
+
+* Add user to docker group
+
+  `usermod -aG docker admin`
+
+* Install docker-compose via
+
+  `curl -L "https://github.com/docker/compose/releases/download/1.27.4/docker-compose-$(uname -s)-$(uname -m)" -o /usr/local/bin/docker-compose`
+
+  (docker compose version 1.27.4 as of today)
+* Make docker-compose executable
+
+  `chmod +x /usr/local/bin/docker-compose`
+
+
+* Add users pub key to 
+    ```
+    mkdir /home/admin/.ssh
+    echo "<pubkey>" >> /home/admin/.ssh/authorized_keys`
+    chown admin:admin -R /home/admin/.ssh
+    ```
+
+* Secure ssh daemon by editing `/etc/ssh/sshd_config`
+    ```
+    PermitRootLogin no
+    ChallengeResponseAuthentication no
+    PasswordAuthentication no
+    UsePAM no
+    ```
+
+* restart sshd server to apply settings `systemctl restart sshd`
+
+* Login as the user you created