Add support for Piwik/Matomo
Add a page to allow register of a matomo server in the manager and the supervision calls to matomo in the pages. It may allow to supervise the user jouney inside lemon, and get data about where, when, who is using it.
In the manager section, add a form with the matomo requiered fields:
- url to register the target matomo server.
Inside the web pages, add the calls to the configured matomo server.