Add support for AMP (official WP plugin)

Afaik it’s not possible to use JavaScript on AMP pages, is it?

Currently, Piwik is not a supported analytics tool:
https://www.ampproject.org/learn/who/#analytics

The Piwik team is discussing this:
https://github.com/piwik/piwik/issues/10539

Anyway, you can use a tracking pixel (with some restrictions) as a workaround:
https://www.elftronix.com/guide-to-using-piwik-analytics-with-amp-on-wordpress/
https://gist.github.com/tiefenb/50041bb1f99762587e0b

I will have a closer look at this soon, and I’ll think about adding the AMP tracking pixel to WP-Piwik, too. If Piwik becomes a supported analytics tool, I will definitely add support to WP-Piwik.