Center the date picker used for the time range filter which looks better when the filter uses the full width

Replace taking over the page by embedding into an element and keeping the query parameters synchronized.

Tie in API requests with navigation so that history usage and external navigation synchronize the internal model.

Use the express-based server instead of Elm's reactor to simplify workflow and enable testing JavaScript interop.

Also replace the meaningless scroll-to-first by actually semantically focussing the first result.

Also use NPM to install development tooling as we already use it in the CI.

Also makes sure to trigger the statistics-driving request for a single dataset.

Use a timer to automatically submit the form when the query was changed helping without an enter key