Move project services to new location under Integrations

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+# Mattermost Notifications Service
+
+## On Mattermost
+
+To enable Mattermost integration you must create an incoming webhook integration:
+
+1. Sign in to your Mattermost instance
+1. Visit incoming webhooks, that will be something like: https://mattermost.example/your_team_name/integrations/incoming_webhooks/add
+1. Choose a display name, description and channel, those can be overridden on GitLab
+1. Save it, copy the **Webhook URL**, we'll need this later for GitLab.
+
+There might be some cases that Incoming Webhooks are blocked by admin, ask your mattermost admin to enable
+it on https://mattermost.example/admin_console/integrations/custom.
+
+Display name override is not enabled by default, you need to ask your admin to enable it on that same section.
+
+## On GitLab
+
+After you set up Mattermost, it's time to set up GitLab.
+
+Go to your project's **Settings > Services > Mattermost Notifications** and you will see a
+checkbox with the following events that can be triggered:
+
+- Push
+- Issue
+- Merge request
+- Note
+- Tag push
+- Build
+- Wiki page
+
+Bellow each of these event checkboxes, you will have an input field to insert
+which Mattermost channel you want to send that event message, with `#town-square`
+being the default. The hash sign is optional.
+
+At the end, fill in your Mattermost details:
+
+| Field | Description |
+| ----- | ----------- |
+| **Webhook**  | The incoming webhooks which you have to setup on Mattermost, it will be something like: http://mattermost.example/hooks/5xo... |
+| **Username** | Optional username which can be on messages sent to Mattermost. Fill this in if you want to change the username of the bot. |
+| **Notify only broken builds** | If you choose to enable the **Build** event and you want to be only notified about failed builds. |
+
+
+![Mattermost configuration](img/mattermost_configuration.png)