keen/dashboards ? reverse-engineered prompt

Build me a set of responsive analytics dashboard templates like the Keen IO examples, so I can drop in charts and use them right away.

I want a clean landing page with a few different dashboard layouts, each one made for showing metrics in a nice grid on desktop and mobile. Include sections for a chart title, the chart area, and optional notes, and make sure the chart areas are easy to connect to live data or demo data later. Use simple, modern styling, and keep the layouts flexible enough for different kinds of dashboards like sales, product usage, or marketing.

Please also add a few example pages that show how the layouts look with sample charts and placeholder data, so it feels ready to use out of the box. If it helps, look up the current docs for the charting and analytics libraries online, and wire things up in a way that would be easy for someone to edit by just swapping in their own data and chart IDs.