[DOCS] Document how to use the official Matomo Docker image with Islandora

[joshdentremont]

• If this is a request for new documentation, where in the existing documentation does this documentation belong?

For Site Template, it could be added here

For Isle-DC, maybe here

• Describe your documentation request.

AT TAG it was discussed that before we get rid of the Matomo image from Buildkit, we should document how to use the official Matomo Docker image in an Isle setup.

Any related open or closed issues to this bug report?

https://github.com/Islandora-Devops/isle-buildkit/pull/336 https://github.com/Islandora-Devops/isle-dc/pull/396 https://github.com/Islandora-Devops/isle-site-template/pull/44