docs(oxitraffic): Add docs

docs/services/oxitraffic.md

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+# OxiTraffic
+
+[OxiTraffic](https://codeberg.org/mo8it/oxitraffic) is a self-hosted, simple and privacy respecting website traffic tracker, that this playbook can install, powered by the [mother-of-all-self-hosting/ansible-role-oxitraffic](https://github.com/mother-of-all-self-hosting/ansible-role-oxitraffic) Ansible role.
+
+## Dependencies
+
+This service requires the following other services:
+
+- a [Postgres](postgres.md) database
+- a [Traefik](traefik.md) reverse-proxy server
+
+
+## Configuration
+
+To enable this service, add the following configuration to your `vars.yml` file and re-run the [installation](../installing.md) process:
+
+```yaml
+########################################################################
+#                                                                      #
+# oxitraffic                                                           #
+#                                                                      #
+########################################################################
+
+oxitraffic_enabled: true
+oxitraffic_hostname: traffic.example.org
+oxitraffic_tracked_origin: https://example.org
+
+########################################################################
+#                                                                      #
+# /oxitraffic                                                          #
+#                                                                      #
+########################################################################
+```
+
+You must include the counting script on the `oxitraffic_tracked_origin` by adding the following to you website
+```html
+<script type="module" src="https://YOUR-OXITRAFFIC_HOSTNAME/count.js"></script>
+```