Add google analytics to the docs and narayana.io

For the docs, see an example here:
https://github.com/pressgang/pressgang-tools/blob/master/pressgang-tools-example/pom.xml#L79

<transformerParameters>
<html.googleAnalyticsId>UA-XXXXXXX-X</html.googleAnalyticsId>
<html.googleTagManagerId>GTM-NJWS5L</html.googleTagManagerId>
<html.googleTagManagerChannel>MyProject</html.googleTagManagerChannel>
</transformerParameters>

We don't want that in normal builds, maybe add it in a release profile and update brp.xml to generate the docs with that enabled.