Add Matomo Cloud tracking code

[cessda-bitbucket-importer]

Original report on BitBucket by John Shepherdson (GitHub: john-shepherdson).

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The code snippet must list the Cloud instance as the first tracker.

On the main cessda.eu website, dual tracking is already implemented, with the full code snippet being as follows (ids have been updated for this application)

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<!-- Matomo -->
<script type="text/javascript">
var _paq = window._paq = window._paq || [];
/* tracker methods like "setCustomDimension" should be called before "trackPageView" */
_paq.push(["setDoNotTrack", true]);
_paq.push(['trackPageView']);
_paq.push(['enableLinkTracking']);
(function() {
var u="https://cessda.matomo.cloud/";
_paq.push(['setTrackerUrl', u+'matomo.php']);
_paq.push(['setSiteId', '5']);
var secondaryTrackerUrl = 'https://analytics.cessda.eu/matomo.php';
var secondaryWebsiteId = 5;
_paq.push(['addTracker', secondaryTrackerUrl, secondaryWebsiteId]);
var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
g.type='text/javascript'; g.async=true; g.src='//cdn.matomo.cloud/cessda.matomo.cloud/matomo.js'; s.parentNode.insertBefore(g,s);
})();
</script>
<!-- End Matomo Code -->

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[cessda-bitbucket-importer]

Original comment by John Admin CESSDA Admin (JWT) (GitHub: john-shepherdson).

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@openconcept Can you look at this at same time as issue #52? Thanks

[cessda-bitbucket-importer]

Original comment by John Shepherdson (GitHub: john-shepherdson).

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See commit https://github.com/cessda/cessda.documentation.theme/commit/1f665970f5544f9a3b85fc35d54e9e5d39a8a7f7

[cessda-bitbucket-importer]

Original comment by John Shepherdson (GitHub: john-shepherdson).

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Need to check Matomo cloud to see if tracking is actually happening