doc: added server documentation template

TEMPLATE.md

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+# Server: Server name
+
+## Usage
+
+Who is using this server?
+Who needs the server and will be affected if the server is not working?
+
+## Maintainers
+
+Who to ask about this server?
+
+## Domain Settings
+
+Where are the DNS settings? E.g. with Hetzner or in a DNS zone file.
+How to change DNS settings?
+Which domains and subdomains exist?
+
+## Hosting
+
+Where is the server hosted?
+Add a link to the hosting admin interface, e.g. <https://console.hetzner.cloud/>.
+
+## Services
+
+Which services are running there?
+E.g. there are a `www.example.org` and `ci.example.org` services.
+
+### Service: ci.example.org
+
+Each service has a greppable heading starting with `### Service: `.
+
+Which software the service is running? E.g. nginx.
+How was it deployed? E.g. manually or with pyinfra.
+How can the software be managed,
+Where the admin credentials are stored if you need to fix something (e.g. for mailcow)?
+Is there an admin chatgroup (e.g. for mailadm) and how to join it?
+
+#### Monitoring
+
+How to read the logs of the service?
+How admins are notified when the service is down?
+
+#### Deployment
+
+How the service was deployed?
+How to reinstall it?
+
+#### Upgrade Strategy
+
+How the service is upgraded?
+Which commands to run to upgrade it, e.g. where the upgrade script is located and how to run it?
+If there is an official documentation, put a link to it in this section.
+
+#### Maintainers
+
+Who to ask about the service?
+
+#### Integration
+
+How the service is related to other services running on this or other servers?
+E.g. service `ci.example.org` uses the secret storage `secrets.example.net` and runner `runner.example.com` hosted elsewhere.
+
+### Service: www.example.org
+
+Description similar to the other service.
+
+## Users
+
+Who has access to this server?
+
+Which admin accounts are there?
+Which service accounts are there?
+Which user accounts are there?
+
+## Monitoring
+
+How do we notice if something fails?
+
+Where do the errors show up?
+Where the logs for the services are located, e.g. Postfix logs go to `/var/log/mail.log`.
+
+## Upgrade Strategy
+
+How do we keep the services up to date?
+
+## Backup and Restore
+
+How the server is backed up and how to restore the backup?
+
+## Deployment
+
+How to reinstall the server?
+Which settings were selected to create the server? E.g. the operating system image.
+Are there deployment scripts, and if any, where they are located and how to run them?
+
+# Changelog
+
+## 2023-05-30 - Created the server
+
+Document the steps taken here.
+
+## 2023-06-10 - Installed nginx
+
+...