Investigate how Matomo data can be visualised/used

[GCHQ-Developer-718]

Summary

Investigate how some data from Matomo can be visualised/used/ingested, e.g. which pages are most/least used, where people get to certain pages from etc. so we can use this information to keep refining the structure and contents of the guidance site.

Implement the easiest visualisations, and create a new ticket for implementing more complex visualisations.

🚨 Urgency (low, medium or high)

Priority 4/5

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Additional info

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