Filter for analytics

[kellpossible]

It would be good to have a filter for the analytics page, using something simple like a substring match, or maybe a regex.

[kellpossible]

I could take some inspiration from https://plausible.io/plausible.io

• User agent parsing for browser and platform.
• graph at top always visible, selecting paths applies a filter
• page URL should update when filters are applied using something like https://htmx.org/attributes/hx-replace-url/ or https://htmx.org/attributes/hx-push-url/
• drop down to select time range instead of displaying all time periods at once
• for the line graph we can inject zero events at intervals relative to the time period, if a real event occurs in the half interval either side then skip injection for that interval. We still probably want the condensing.

[kellpossible]

Another analytic I would like to track is language as parsed and used by the i18n middleware.

[kellpossible]

Analytics could probably be split out into its own repo too

[kellpossible]

already implemented