ewan-escience

Related to tracking, and in the light of #161, can the `data-ga="UA-55088238-8"` code and the plugin `ga.min.js` be removed?`

According to the documentation, you can also use [Matomo without consent or cookie banner](https://matomo.org/faq/new-to-piwik/how-do-i-use-matomo-analytics-without-consent-or-cookie-banner/). This does impact [the accuracy](https://matomo.org/faq/general/faq_156/). We might also need a [privacy policy](https://matomo.org/faq/general/faq_152/).